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HIGHLIGHTED ARTICLES

Ultrafast terahertz-field-driven ionic response in ferroelectric BaTiO3

F. Chen et al.

Phys. Rev. B 94, 180104(R) (2016) - Published 22 November, 2016

Ferroelectric materials encode information through the displacement of atoms within the unit cell, but the ultimate speed limits governing how fast the polarization can change and how it responds to electric fields remain largely unknown. These processes in turn fundamentally determine the functionality of ferroelectric materials within devices. Here, the authors show that single-cycle light pulses at terahertz frequencies can be used as an ultrafast electric field to drive large amplitude rotations of the ferroelectric polarization on picosecond time scales within the prototypical ferroelectric BaTiO3, probed by femtosecond x-ray scattering to directly resolve the motions of the atoms. These measurements are connected directly to first-principles molecular dynamics simulations of ultrafast electric-field-driven effects in ferroelectrics with good agreement obtained between experiment and theory.

Time-dependent correlations in quantum magnets at finite temperature

B. Fauseweh, F. Groitl, T. Keller, K. Rolfs, D. A. Tennant, K. Habicht, and G. S. Uhrig

Phys. Rev. B 94, 180404(R) (2016) - Published 8 November, 2016

Complex interactions in quantum magnets lead to a variety of phases with manifold correlations, which are measurable at temperatures very low compared to the energy scale of the system. The common expectation is that quantum effects are just suppressed upon increasing temperature due to the additional thermal fluctuations. However, recent inelastic neutron scattering investigations in one- and three-dimensional compounds indicate that interplay between quantum and thermal effects is much more complicated. By combining high-resolution neutron resonance spin-echo measurements with diagrammatic perturbation theory, the authors show that anomalous decoherence effects can also be observed in the time domain, the natural domain for decaying correlations. This offers a complementary view on this phenomenon, allowing for a direct comparison between experimental data and theoretical prediction without the need for intensive data analysis. The specific form of the echo amplitude, in combination with the temperature dependence of the spectral weight, provides a smoking gun signature for nontrivial scattering processes of hard-core bosonic excitations.

Odd-parity superconductors with two-component order parameters: Nematic and chiral, full gap, and Majorana node

Jörn W. F. Venderbos, Vladyslav Kozii, and Liang Fu

Phys. Rev. B 94, 180504(R) (2016) - Published 10 November, 2016

Recently, there is widespread interest in odd-parity (e.g., p-wave) superconductivity in strongly spin-orbit-coupled materials, such as doped topological insulators. CuxBi2Se3 is a prime example. A series of recent experiments, including NMR, specific heat, magnetoresistance, and torque magnetometry, has provided mounting evidence of odd-parity spin-triplet superconductivity in CuxBi2Se3 as well as SrxBi2Se3 and NbxBi2Se3. Here, the authors construct a general theory of such degenerate superconducting components and the competition between chiral and nematic states. They derive a general criterion to establish which state is energetically favored, which highlights the crucial role of spin-orbit coupling. In particular, when applied to the specific case of CuxBi2Se3, the theory is consistent with three key experimental findings: a full pairing gap, triplet pairing, and spontaneous rotational symmetry breaking. Remarkably, both nematic and chiral superconductors with odd-parity pairing symmetry are topological superconductors, belonging respectively to time-reversal-invariant (class DIII) and time-reversal-breaking (class D) categories of the topological classification. The authors show that due to the nonunitary nature of chiral pairing in spin-orbit coupled materials, spin nondegenerate point nodes realize Majorana fermion quasiparticles in three dimensions.

Role of electron and phonon temperatures in the helicity-independent all-optical switching of GdFeCo

J. Gorchon, R. B. Wilson, Y. Yang, A. Pattabi, J. Y. Chen, L. He, J. P. Wang, M. Li, and J. Bokor

Phys. Rev. B 94, 184406 (2016) - Published 4 November, 2016

GdFeCo ferrimagnetic films have the unique property of responding with a full reversal of the magnetization following irradiation of a single femtosecond laser pulse. The switching of the magnetization happens within a picosecond. Referred to as “all-optical switching,” the mechanism has been attributed to the rapid heating of electrons to extremely high peak temperatures and to the existence of two different magnetic sublattices. In this work, the authors demonstrate that all-optical switching is possible for pulses up to 15 ps in duration, where the electron peak temperatures are much more modest, barely reaching the Curie temperature. This result was obtained by using static and time-resolved experiments to access the critical switching fluences and the magnetization dynamics for various pulse durations and initial temperatures.

Revisiting the ground state of CoAl2O4: Comparison to the conventional antiferromagnet MnAl2O4

G. J. MacDougall, A. A. Aczel, Yixi Su, W. Schweika, E. Faulhaber, A. Schneidewind, A. D. Christianson, J. L. Zarestky, H. D. Zhou, D. Mandrus, and S. E. Nagler

Phys. Rev. B 94, 184422 (2016) - Published 17 November, 2016

The spinel aluminates (AAl2O4) are physical realizations of the diamond-lattice antiferromagnet, a model system wherein competing nearest- (J1) and next-nearest- (J2) exchange interactions frustrate order and can lead to novel magnetic ground states, including a “spiral spin liquid” (SSL). CoAl2O4 has been studied intensely as a SSL candidate, and exhibits unusual low-temperature short-range correlations that have been interpreted as arising from unconventional spin-glass behavior or antiferromagnetism, possibly with SSL correlations, but with no clear consensus to date. It has been suggested that the tendency towards “cation inversion” disorder inhibits long-range order. Here, the authors provide a comparative neutron scattering study of single crystals of the two spinel aluminates CoAl2O4 and MnAl2O4. Despite the fact that MnAl2O4 has greater cation inversion, it clearly behaves as a classical Néel antiferromagnet. In contrast, CoAl2O4 exhibits a freezing transition at T* = 6.5 K into a phase characterized by finite-sized domains separated by a series of sharp walls. The results are consistent with kinetically inhibited domain growth, which can arise naturally in a frustrated magnet containing a first-order phase transition. The ratio J2/J1 is close to the value where theory predicts such a transition. The contrast with MnAl2O4 shows that frustration arising from competing interactions, and not disorder, is the driving factor in determining the low-temperature magnetic state in CoAl2O4.

Direct observation of anisotropic magnetic field response of the spin helix in FeGe thin films

N. Kanazawa, J. S. White, H. M. Rønnow, C. D. Dewhurst, Y. Fujishiro, A. Tsukazaki, Y. Kozuka, M. Kawasaki, M. Ichikawa, F. Kagawa, and Y. Tokura

Phys. Rev. B 94, 184432 (2016) - Published 28 November, 2016

Spiral spin orders often produce various fascinating phenomena via interaction with electronic structures. Examples include, but are not limited to, multiferroicity and skyrmion formation. Among them, a deformed spiral spin structure, which can be viewed as a periodic sequence of 2π spin-rotation kinks, can exhibit the functionality of information transmission owing to its phase coherence. This is the chiral magnetic soliton lattice (CSL). Here, the authors have succeeded in building a spin spiral in a thin film of the chiral magnet FeGe, and revealed its characteristic magnetic responses. Magnetic anisotropy and boundary conditions inherent to the epitaxial thin film secure the alignment of the spiral winding direction along the film normal, even under external magnetic fields. This constraint leads to the anisotropic deformation of the spin spiral with respect to the magnetic field direction. Especially, the CSL, which is realized under an in-plane magnetic field, transforms with field between states with different numbers of kinks. The authors clearly demonstrate the deformation by direct observation of the spiral propagation vector by use of the small-angle neutron scattering technique.

Otto refrigerator based on a superconducting qubit: Classical and quantum performance

B. Karimi and J. P. Pekola

Phys. Rev. B 94, 184503 (2016) - Published 9 November, 2016

Experimental demonstration of a truly quantum mechanical solid-state heat engine or refrigerator remains elusive up to now. Here, a four-stroke quantum refrigerator that can be realized using a superconducting qubit coupled alternately to two resonators with embedded reservoirs is analyzed theoretically. Besides being a practically feasible thermal machine, this concept presents a number of fundamentally interesting features. At high frequencies, the system exhibits nearly coherent dynamics, leading to quantum oscillations in cooling power versus operation frequency. At intermediate frequencies, an ideal Otto cycle can be realized. In the nearly adiabatic regime, the cooling power is quadratic in frequency and can be separated to classical and quantum contributions. Interestingly, it is shown here that quantum coherence leads always to performance that is inferior as compared to that arising from purely classical dynamics. Furthermore, in the nearly adiabatic regime the efficiency of the refrigerator exceeds clearly that of the standard Otto cycle.

Direct observation of charge order in underdoped and optimally doped Bi2(Sr,La)2CuO6+δ by resonant inelastic x-ray scattering

Y. Y. Peng, M. Salluzzo, X. Sun, A. Ponti, D. Betto, A. M. Ferretti, F. Fumagalli, K. Kummer, M. Le Tacon, X. J. Zhou, N. B. Brookes, L. Braicovich, and G. Ghiringhelli

Phys. Rev. B 94, 184511 (2016) - Published 28 November, 2016

The already overcrowded phase diagram of cuprate superconductors has recently accommodated a region characterized by incommensurate charge density waves (CDW), partly overlapping with superconductivity, and included in the pseudogap regime. Although charge order is strengthened by high magnetic fields and competes with superconductivity, its role in Cooper pairing is still unassessed, calling for more complete characterization in different families of cuprates. The authors present an extensive x-ray scattering study of charge order in single layer La-doped Bi2201, and they show it extends up to optimal-doping (OP33K, p=0.16) in this family too. The CDW peak sharpens at Tc and disappears above the pseudogap onset at temperature T*. They also demonstrate that in the underdoped sample (OD15K, p=0.115) the charge density wave has no out-of-plane correlation and has dominant unidirectional nature within the planes.

RAPID COMMUNICATIONS

Structure, structural phase transitions, mechanical properties, defects

Nonstoichiometry and Weyl fermionic behavior in TaAs

J. Buckeridge, D. Jevdokimovs, C. R. A. Catlow, and A. A. Sokol

Phys. Rev. B 94, 180101(R) (2016) - Published 1 November, 2016

Effects of atomic short-range order on properties of the PbMg1/3Nb2/3O3 relaxor ferroelectric

Sergey Prosandeev and L. Bellaiche

Phys. Rev. B 94, 180102(R) (2016) - Published 3 November, 2016

Microscopic origin of entropy-driven polymorphism in hybrid organic-inorganic perovskite materials

Keith T. Butler, Katrine Svane, Gregor Kieslich, Anthony K. Cheetham, and Aron Walsh

Phys. Rev. B 94, 180103(R) (2016) - Published 7 November, 2016

Ultrafast terahertz-field-driven ionic response in ferroelectric BaTiO3

F. Chen et al.

Phys. Rev. B 94, 180104(R) (2016) - Published 22 November, 2016

Ferroelectric materials encode information through the displacement of atoms within the unit cell, but the ultimate speed limits governing how fast the polarization can change and how it responds to electric fields remain largely unknown. These processes in turn fundamentally determine the functionality of ferroelectric materials within devices. Here, the authors show that single-cycle light pulses at terahertz frequencies can be used as an ultrafast electric field to drive large amplitude rotations of the ferroelectric polarization on picosecond time scales within the prototypical ferroelectric BaTiO3, probed by femtosecond x-ray scattering to directly resolve the motions of the atoms. These measurements are connected directly to first-principles molecular dynamics simulations of ultrafast electric-field-driven effects in ferroelectrics with good agreement obtained between experiment and theory.

Crystal structure, stability, and optoelectronic properties of the organic-inorganic wide-band-gap perovskite CH3NH3BaI3: Candidate for transparent conductor applications

Akash Kumar, K. R. Balasubramaniam, Jiban Kangsabanik, Vikram, and Aftab Alam

Phys. Rev. B 94, 180105(R) (2016) - Published 23 November, 2016

Inhomogeneous, disordered, and partially ordered systems

First-principles computation of random-pinning glass transition, glass cooperative length scales, and numerical comparisons

Chiara Cammarota and Beatriz Seoane

Phys. Rev. B 94, 180201(R) (2016) - Published 3 November, 2016

Single spin probe of many-body localization

Evert P. L. van Nieuwenburg, Sebastian D. Huber, and R. Chitra

Phys. Rev. B 94, 180202(R) (2016) - Published 23 November, 2016

Magnetism

Typicality approach to the optical conductivity in thermal and many-body localized phases

Robin Steinigeweg, Jacek Herbrych, Frank Pollmann, and Wolfram Brenig

Phys. Rev. B 94, 180401(R) (2016) - Published 1 November, 2016

Temperature dependence of the magnon spin diffusion length and magnon spin conductivity in the magnetic insulator yttrium iron garnet

L. J. Cornelissen, J. Shan, and B. J. van Wees

Phys. Rev. B 94, 180402(R) (2016) - Published 4 November, 2016

Anisotropic Hanle line shape via magnetothermoelectric phenomena

K. S. Das, F. K. Dejene, B. J. van Wees, and I. J. Vera-Marun

Phys. Rev. B 94, 180403(R) (2016) - Published 7 November, 2016

Time-dependent correlations in quantum magnets at finite temperature

B. Fauseweh, F. Groitl, T. Keller, K. Rolfs, D. A. Tennant, K. Habicht, and G. S. Uhrig

Phys. Rev. B 94, 180404(R) (2016) - Published 8 November, 2016

Complex interactions in quantum magnets lead to a variety of phases with manifold correlations, which are measurable at temperatures very low compared to the energy scale of the system. The common expectation is that quantum effects are just suppressed upon increasing temperature due to the additional thermal fluctuations. However, recent inelastic neutron scattering investigations in one- and three-dimensional compounds indicate that interplay between quantum and thermal effects is much more complicated. By combining high-resolution neutron resonance spin-echo measurements with diagrammatic perturbation theory, the authors show that anomalous decoherence effects can also be observed in the time domain, the natural domain for decaying correlations. This offers a complementary view on this phenomenon, allowing for a direct comparison between experimental data and theoretical prediction without the need for intensive data analysis. The specific form of the echo amplitude, in combination with the temperature dependence of the spectral weight, provides a smoking gun signature for nontrivial scattering processes of hard-core bosonic excitations.

Collective magnetic excitations of C4-symmetric magnetic states in iron-based superconductors

Daniel D. Scherer, Ilya Eremin, and Brian M. Andersen

Phys. Rev. B 94, 180405(R) (2016) - Published 21 November, 2016

Strong spin-orbit fields and Dyakonov-Perel spin dephasing in supported metallic films

Nguyen H. Long, Phivos Mavropoulos, David S. G. Bauer, Bernd Zimmermann, Yuriy Mokrousov, and Stefan Blügel

Phys. Rev. B 94, 180406(R) (2016) - Published 22 November, 2016

Revealing the hidden structural phases of FeRh

Jinwoong Kim, R. Ramesh, and Nicholas Kioussis

Phys. Rev. B 94, 180407(R) (2016) - Published 22 November, 2016

Interfacial control of Dzyaloshinskii-Moriya interaction in heavy metal/ferromagnetic metal thin film heterostructures

Xin Ma, Guoqiang Yu, Xiang Li, Tao Wang, Di Wu, Kevin S. Olsson, Zhaodong Chu, Kyongmo An, John Q. Xiao, Kang L. Wang, and Xiaoqin Li

Phys. Rev. B 94, 180408(R) (2016) - Published 28 November, 2016

Controlling Gilbert damping in a YIG film using nonlocal spin currents

M. Haidar, P. Dürrenfeld, M. Ranjbar, M. Balinsky, M. Fazlali, M. Dvornik, R. K. Dumas, S. Khartsev, and J. Åkerman

Phys. Rev. B 94, 180409(R) (2016) - Published 28 November, 2016

Superfluidity and superconductivity

Possible quantum liquid crystal phases of helium monolayers

S. Nakamura, K. Matsui, T. Matsui, and Hiroshi Fukuyama

Phys. Rev. B 94, 180501(R) (2016) - Published 4 November, 2016

Manifestation of extrinsic spin Hall effect in superconducting structures: Nondissipative magnetoelectric effects

F. Sebastian Bergeret and Ilya V. Tokatly

Phys. Rev. B 94, 180502(R) (2016) - Published 7 November, 2016

Granular superconductivity and magnetic-field-driven recovery of macroscopic coherence in a cuprate/manganite multilayer

B. P. P. Mallett, J. Khmaladze, P. Marsik, E. Perret, A. Cerreta, M. Orlita, N. Biškup, M. Varela, and C. Bernhard

Phys. Rev. B 94, 180503(R) (2016) - Published 8 November, 2016

Odd-parity superconductors with two-component order parameters: Nematic and chiral, full gap, and Majorana node

Jörn W. F. Venderbos, Vladyslav Kozii, and Liang Fu

Phys. Rev. B 94, 180504(R) (2016) - Published 10 November, 2016

Recently, there is widespread interest in odd-parity (e.g., p-wave) superconductivity in strongly spin-orbit-coupled materials, such as doped topological insulators. CuxBi2Se3 is a prime example. A series of recent experiments, including NMR, specific heat, magnetoresistance, and torque magnetometry, has provided mounting evidence of odd-parity spin-triplet superconductivity in CuxBi2Se3 as well as SrxBi2Se3 and NbxBi2Se3. Here, the authors construct a general theory of such degenerate superconducting components and the competition between chiral and nematic states. They derive a general criterion to establish which state is energetically favored, which highlights the crucial role of spin-orbit coupling. In particular, when applied to the specific case of CuxBi2Se3, the theory is consistent with three key experimental findings: a full pairing gap, triplet pairing, and spontaneous rotational symmetry breaking. Remarkably, both nematic and chiral superconductors with odd-parity pairing symmetry are topological superconductors, belonging respectively to time-reversal-invariant (class DIII) and time-reversal-breaking (class D) categories of the topological classification. The authors show that due to the nonunitary nature of chiral pairing in spin-orbit coupled materials, spin nondegenerate point nodes realize Majorana fermion quasiparticles in three dimensions.

Quantum ground state control in superconductor-silicene structures: 0-π transitions, φ0-junctions, and Majorana bound states

Dushko Kuzmanovski, Jacob Linder, and Annica Black-Schaffer

Phys. Rev. B 94, 180505(R) (2016) - Published 11 November, 2016

Triplet FFLO superconductivity in the doped Kitaev-Heisenberg honeycomb model

Tianhan Liu, Cécile Repellin, Benoît Douçot, Nicolas Regnault, and Karyn Le Hur

Phys. Rev. B 94, 180506(R) (2016) - Published 14 November, 2016

Absence of the O17 Knight-shift changes across the first-order phase transition line in Sr2RuO4

Masahiro Manago, Kenji Ishida, Zhiqiang Mao, and Yoshiteru Maeno

Phys. Rev. B 94, 180507(R) (2016) - Published 16 November, 2016

Coherent dynamics and decoherence in a superconducting weak link

J. T. Peltonen, Z. H. Peng, Yu. P. Korneeva, B. M. Voronov, A. A. Korneev, A. V. Semenov, G. N. Gol'tsman, J. S. Tsai, and O. V. Astafiev

Phys. Rev. B 94, 180508(R) (2016) - Published 21 November, 2016

Bulk superconductivity at 84 K in the strongly overdoped regime of cuprates

A. Gauzzi, Y. Klein, M. Nisula, M. Karppinen, P. K. Biswas, H. Saadaoui, E. Morenzoni, P. Manuel, D. Khalyavin, M. Marezio, and T. H. Geballe

Phys. Rev. B 94, 180509(R) (2016) - Published 22 November, 2016

Evidence of nodes in the order parameter of the superconducting doped topological insulator NbxBi2Se3 via penetration depth measurements

M. P. Smylie, H. Claus, U. Welp, W.-K. Kwok, Y. Qiu, Y. S. Hor, and A. Snezhko

Phys. Rev. B 94, 180510(R) (2016) - Published 23 November, 2016

ARTICLES

Structure, structural phase transitions, mechanical properties, defects

Origin of discrepancy between electrical and mechanical anomalies in lead-free (K,Na)NbO3-based ceramics

A. M. Mazuera, P. S. Silva, Jr., A. D. Rodrigues, P. S. Pizani, Y. Romaguera-Barcelay, M. Venet, and M. Algueró

Phys. Rev. B 94, 184101 (2016) - Published 7 November, 2016

Half-metallic Co-based quaternary Heusler alloys for spintronics: Defect- and pressure-induced transitions and properties

Enamullah, D. D. Johnson, K. G. Suresh, and Aftab Alam

Phys. Rev. B 94, 184102 (2016) - Published 7 November, 2016

Fermi liquid theory applied to a film on an oscillating substrate

J. A. Kuorelahti, J. A. Tuorila, and E. V. Thuneberg

Phys. Rev. B 94, 184103 (2016) - Published 7 November, 2016

Analytical trajectories of skyrmions in confined geometries: Skyrmionic racetracks and nano-oscillators

Carles Navau, Nuria Del-Valle, and Alvaro Sanchez

Phys. Rev. B 94, 184104 (2016) - Published 10 November, 2016

Frustrated pretransitional phenomena in aperiodic composites

C. Mariette, Ilya Frantsuzov, Bo Wang, L. Guérin, P. Rabiller, Mark D. Hollingsworth, and B. Toudic

Phys. Rev. B 94, 184105 (2016) - Published 11 November, 2016

Emergence of a fluctuating state in the stuffed tridymite-type oxides Ba1−xSrxAl2O4

Y. Ishii, H. Tsukasaki, E. Tanaka, S. Kawaguchi, and S. Mori

Phys. Rev. B 94, 184106 (2016) - Published 11 November, 2016

Equation of state, adiabatic sound speed, and Grüneisen coefficient of boron carbide along the principal Hugoniot to 700 GPa

D. E. Fratanduono, P. M. Celliers, D. G. Braun, P. A. Sterne, S. Hamel, A. Shamp, E. Zurek, K. J. Wu, A. E. Lazicki, M. Millot, and G. W. Collins

Phys. Rev. B 94, 184107 (2016) - Published 16 November, 2016

Intrinsic polarization switching in BaTiO3 crystal under uniaxial electromechanical loading

Yingwei Li, Jie Wang, and Faxin Li

Phys. Rev. B 94, 184108 (2016) - Published 21 November, 2016

Molecular dynamics study on β-phase vanadium monohydride with machine learning potential

Kazutoshi Miwa and Hiroshi Ohno

Phys. Rev. B 94, 184109 (2016) - Published 23 November, 2016

Ab initio study of deformed As, Sb, and Bi with an application to thin films

M. Zouhar and M. Šob

Phys. Rev. B 94, 184110 (2016) - Published 28 November, 2016

Melting temperature of water: DFT-based molecular dynamics simulations with D3 dispersion correction

Ari P. Seitsonen and Taras Bryk

Phys. Rev. B 94, 184111 (2016) - Published 29 November, 2016

Inhomogeneous, disordered, and partially ordered systems

Constant real-space fractal dimensionality and structure evolution in Ti62Cu38 metallic glass under high pressure

Liangliang Li, Luhong Wang, Renfeng Li, Haiyan Zhao, Dongdong Qu, Karena W. Chapman, Peter J. Chupas, and Haozhe Liu

Phys. Rev. B 94, 184201 (2016) - Published 7 November, 2016

Bimodal entanglement entropy distribution in the many-body localization transition

Xiongjie Yu, David J. Luitz, and Bryan K. Clark

Phys. Rev. B 94, 184202 (2016) - Published 15 November, 2016

Fractality of wave functions on a Cayley tree: Difference between tree and locally treelike graph without boundary

K. S. Tikhonov and A. D. Mirlin

Phys. Rev. B 94, 184203 (2016) - Published 17 November, 2016

Dynamics, dynamical systems, lattice effects

Dephasing mechanisms of optical transitions in rare-earth-doped transparent ceramics

Nathalie Kunkel, John Bartholomew, Sacha Welinski, Alban Ferrier, Akio Ikesue, and Philippe Goldner

Phys. Rev. B 94, 184301 (2016) - Published 1 November, 2016

Apparent rippling with honeycomb symmetry and tunable periodicity observed by scanning tunneling microscopy on suspended graphene

A. Georgi, P. Nemes-Incze, B. Szafranek, D. Neumaier, V. Geringer, M. Liebmann, and M. Morgenstern

Phys. Rev. B 94, 184302 (2016) - Published 4 November, 2016

Quantum dynamics of impurities coupled to a Fermi sea

Meera M. Parish and Jesper Levinsen

Phys. Rev. B 94, 184303 (2016) - Published 4 November, 2016

Long-time asymptotic state of periodically driven open quantum systems

Koudai Iwahori and Norio Kawakami

Phys. Rev. B 94, 184304 (2016) - Published 8 November, 2016

c-number quantum generalized Langevin equation for an open system

L. Kantorovich, H. Ness, L. Stella, and C. D. Lorenz

Phys. Rev. B 94, 184305 (2016) - Published 8 November, 2016

Doping-enhanced dipolar dynamics in ice V as a precursor of hydrogen ordering in ice XIII

K. W. Köster, A. Raidt, V. Fuentes Landete, C. Gainaru, T. Loerting, and R. Böhmer

Phys. Rev. B 94, 184306 (2016) - Published 15 November, 2016

Coherent lattice dynamics in opaque crystals: Testing the adequacy of two-tensor model

O. V. Misochko and M. V. Lebedev

Phys. Rev. B 94, 184307 (2016) - Published 17 November, 2016

Self-consistent Keldysh approach to quenches in the weakly interacting Bose-Hubbard model

N. Lo Gullo and L. Dell'Anna

Phys. Rev. B 94, 184308 (2016) - Published 18 November, 2016

Soft-phonon-driven orbital order in CaMn7O12

S. M. Souliou, Y. Li, X. Du, M. Le Tacon, and A. Bosak

Phys. Rev. B 94, 184309 (2016) - Published 22 November, 2016

Ab initio evidence for nonthermal characteristics in ultrafast laser melting

Chao Lian, S. B. Zhang, and Sheng Meng

Phys. Rev. B 94, 184310 (2016) - Published 28 November, 2016

Temperature fluctuations in canonical systems: Insights from molecular dynamics simulations

J. Hickman and Y. Mishin

Phys. Rev. B 94, 184311 (2016) - Published 29 November, 2016

Magnetism

Magnetization dynamics and spin pumping induced by standing elastic waves

A. V. Azovtsev and N. A. Pertsev

Phys. Rev. B 94, 184401 (2016) - Published 1 November, 2016

Perpendicular magnetic anisotropy of two-dimensional Rashba ferromagnets

Kyoung-Whan Kim, Kyung-Jin Lee, Hyun-Woo Lee, and M. D. Stiles

Phys. Rev. B 94, 184402 (2016) - Published 3 November, 2016

Criticality revealed through quench dynamics in the Lipkin-Meshkov-Glick model

Steve Campbell

Phys. Rev. B 94, 184403 (2016) - Published 4 November, 2016

Cross-type orbital ordering in the layered hybrid organic-inorganic compound (C6H5CH2CH2NH3)2CuCl4

A. A. Nugroho, Z. Hu, C. Y. Kuo, M. W. Haverkort, T. W. Pi, D. Onggo, M. Valldor, and L. H. Tjeng

Phys. Rev. B 94, 184404 (2016) - Published 4 November, 2016

Spin transport in half-metallic ferromagnets

Y. Ohnuma, M. Matsuo, and S. Maekawa

Phys. Rev. B 94, 184405 (2016) - Published 4 November, 2016

Role of electron and phonon temperatures in the helicity-independent all-optical switching of GdFeCo

J. Gorchon, R. B. Wilson, Y. Yang, A. Pattabi, J. Y. Chen, L. He, J. P. Wang, M. Li, and J. Bokor

Phys. Rev. B 94, 184406 (2016) - Published 4 November, 2016

GdFeCo ferrimagnetic films have the unique property of responding with a full reversal of the magnetization following irradiation of a single femtosecond laser pulse. The switching of the magnetization happens within a picosecond. Referred to as “all-optical switching,” the mechanism has been attributed to the rapid heating of electrons to extremely high peak temperatures and to the existence of two different magnetic sublattices. In this work, the authors demonstrate that all-optical switching is possible for pulses up to 15 ps in duration, where the electron peak temperatures are much more modest, barely reaching the Curie temperature. This result was obtained by using static and time-resolved experiments to access the critical switching fluences and the magnetization dynamics for various pulse durations and initial temperatures.

Time-dependent rotatable magnetic anisotropy in polycrystalline exchange-bias systems: Dependence on grain-size distribution

Nicolas David Müglich, Alexander Gaul, Markus Meyl, Arno Ehresmann, Gerhard Götz, Günter Reiss, and Timo Kuschel

Phys. Rev. B 94, 184407 (2016) - Published 9 November, 2016

Magnetoelectricity of single molecular toroics: The Dy4 ring cluster

A. I. Popov, D. I. Plokhov, and A. K. Zvezdin

Phys. Rev. B 94, 184408 (2016) - Published 9 November, 2016

Radiation losses and dark mode for spin-wave propagation through a discrete magnetic micro-waveguide

Yuri Barabanenkov, Sergey Osokin, Dmitry Kalyabin, and Sergey Nikitov

Phys. Rev. B 94, 184409 (2016) - Published 9 November, 2016

Probing core and shell contributions to exchange bias in Co/Co3O4 nanoparticles of controlled size

D. De, Òscar Iglesias, S. Majumdar, and Saurav Giri

Phys. Rev. B 94, 184410 (2016) - Published 11 November, 2016

Spin-wave eigenmodes in single disk-shaped FeB nanomagnet

Jaehun Cho, Shinji Miwa, Kay Yakushiji, Shingo Tamaru, Hitoshi Kubota, Akio Fukushima, Satoshi Fujimoto, Eiiti Tamura, Chun-Yeol You, Shinji Yuasa, and Yoshishige Suzuki

Phys. Rev. B 94, 184411 (2016) - Published 11 November, 2016

Magnetization switching behavior with competing anisotropies in epitaxial Co3FeN/MnN exchange-coupled bilayers

T. Hajiri, T. Yoshida, S. Jaiswal, M. Filianina, B. Borie, H. Ando, H. Asano, H. Zabel, and M. Kläui

Phys. Rev. B 94, 184412 (2016) - Published 11 November, 2016

Anisotropic physical properties and pressure dependent magnetic ordering of CrAuTe4

Na Hyun Jo, Udhara S. Kaluarachchi, Yun Wu, Daixiang Mou, Lunan Huang, Valentin Taufour, Adam Kaminski, Sergey L. Bud'ko, and Paul C. Canfield

Phys. Rev. B 94, 184413 (2016) - Published 11 November, 2016

Multiscale model approach for magnetization dynamics simulations

Andrea De Lucia, Benjamin Krüger, Oleg A. Tretiakov, and Mathias Kläui

Phys. Rev. B 94, 184415 (2016) - Published 14 November, 2016

Structure of MnSi on SiC(0001)

S. A. Meynell, A. Spitzig, B. Edwards, M. D. Robertson, D. Kalliecharan, L. Kreplak, and T. L. Monchesky

Phys. Rev. B 94, 184416 (2016) - Published 14 November, 2016

Influence of thickness-dependent structural evolution on ultrafast magnetization dynamics in Co2Fe0.4Mn0.6Si Heusler alloy thin films

Santanu Pan, Sucheta Mondal, Takeshi Seki, Koki Takanashi, and Anjan Barman

Phys. Rev. B 94, 184417 (2016) - Published 15 November, 2016

Evidence for a collinear easy-plane magnetic structure of multiferroic EuFe3(BO3)4: Spectroscopic and theoretical studies

M. N. Popova, B. Z. Malkin, K. N. Boldyrev, T. N. Stanislavchuk, D. A. Erofeev, V. L. Temerov, and I. A. Gudim

Phys. Rev. B 94, 184418 (2016) - Published 15 November, 2016

Mechanism for strong magnetoelectric coupling in dilute magnetic ferroelectrics

L. Weston, X. Y. Cui, S. P. Ringer, and C. Stampfl

Phys. Rev. B 94, 184419 (2016) - Published 16 November, 2016

Torque undergone by assemblies of single-domain magnetic nanoparticles submitted to a rotating magnetic field

J. Carrey and N. Hallali

Phys. Rev. B 94, 184420 (2016) - Published 17 November, 2016

Multiple low-energy excitation states in FeNi disks observed by broadband ferromagnetic resonance measurement

Y. Huo, C. Zhou, L. Sun, S. T. Chui, and Y. Z. Wu

Phys. Rev. B 94, 184421 (2016) - Published 17 November, 2016

Revisiting the ground state of CoAl2O4: Comparison to the conventional antiferromagnet MnAl2O4

G. J. MacDougall, A. A. Aczel, Yixi Su, W. Schweika, E. Faulhaber, A. Schneidewind, A. D. Christianson, J. L. Zarestky, H. D. Zhou, D. Mandrus, and S. E. Nagler

Phys. Rev. B 94, 184422 (2016) - Published 17 November, 2016

The spinel aluminates (AAl2O4) are physical realizations of the diamond-lattice antiferromagnet, a model system wherein competing nearest- (J1) and next-nearest- (J2) exchange interactions frustrate order and can lead to novel magnetic ground states, including a “spiral spin liquid” (SSL). CoAl2O4 has been studied intensely as a SSL candidate, and exhibits unusual low-temperature short-range correlations that have been interpreted as arising from unconventional spin-glass behavior or antiferromagnetism, possibly with SSL correlations, but with no clear consensus to date. It has been suggested that the tendency towards “cation inversion” disorder inhibits long-range order. Here, the authors provide a comparative neutron scattering study of single crystals of the two spinel aluminates CoAl2O4 and MnAl2O4. Despite the fact that MnAl2O4 has greater cation inversion, it clearly behaves as a classical Néel antiferromagnet. In contrast, CoAl2O4 exhibits a freezing transition at T* = 6.5 K into a phase characterized by finite-sized domains separated by a series of sharp walls. The results are consistent with kinetically inhibited domain growth, which can arise naturally in a frustrated magnet containing a first-order phase transition. The ratio J2/J1 is close to the value where theory predicts such a transition. The contrast with MnAl2O4 shows that frustration arising from competing interactions, and not disorder, is the driving factor in determining the low-temperature magnetic state in CoAl2O4.

Conversion between spin and charge currents with topological insulators

S. Zhang and A. Fert

Phys. Rev. B 94, 184423 (2016) - Published 18 November, 2016

Metal-insulator transition in Ba3Fe1−xRu2+xO9: Interplay between site disorder, chemical percolation, and electronic structure

S. Middey, Payel Aich, C. Meneghini, K. Mukherjee, E. V. Sampathkumaran, V. Siruguri, P. Mahadevan, and Sugata Ray

Phys. Rev. B 94, 184424 (2016) - Published 18 November, 2016

Atomic displacements and lattice distortion in the magnetic-field-induced charge-ordered state of SmRu4P12

Takeshi Matsumura, Shinji Michimura, Toshiya Inami, Kengo Fushiya, Tatsuma D. Matsuda, Ryuji Higashinaka, Yuji Aoki, and Hitoshi Sugawara

Phys. Rev. B 94, 184425 (2016) - Published 21 November, 2016

High-pressure synthesis of the layered iron oxyselenide BaFe2Se2O with strong magnetic anisotropy

Fumitaka Takeiri, Yuki Matsumoto, Takafumi Yamamoto, Naoaki Hayashi, Zhi Li, Takami Tohyama, Cédric Tassel, Clemens Ritter, Yasuo Narumi, Masayuki Hagiwara, and Hiroshi Kageyama

Phys. Rev. B 94, 184426 (2016) - Published 21 November, 2016

Low-field-enhanced unusual hysteresis produced by metamagnetism of the MnP clusters in the insulating CdGeP2 matrix under pressure

T. R. Arslanov, R. K. Arslanov, L. Kilanski, T. Chatterji, I. V. Fedorchenko, R. M. Emirov, and A. I. Ril

Phys. Rev. B 94, 184427 (2016) - Published 22 November, 2016

Electronic and magnetic properties of single-layer MPX3 metal phosphorous trichalcogenides

Bheema Lingam Chittari, Youngju Park, Dongkyu Lee, Moonsup Han, Allan H. MacDonald, Euyheon Hwang, and Jeil Jung

Phys. Rev. B 94, 184428 (2016) - Published 22 November, 2016

Directly probing spin dynamics in insulating antiferromagnets using ultrashort terahertz pulses

P. Bowlan, S. A. Trugman, X. Wang, Y. M. Dai, S.-W. Cheong, E. D. Bauer, A. J. Taylor, D. A. Yarotski, and R. P. Prasankumar

Phys. Rev. B 94, 184429 (2016) - Published 22 November, 2016

Electronic and magnetic properties of 2H−NbS2 intercalated by 3d transition metals

S. Mankovsky, S. Polesya, H. Ebert, and W. Bensch

Phys. Rev. B 94, 184430 (2016) - Published 23 November, 2016

Size-induced crossover from itinerant to localized magnetism observed for isolated Fe impurities embedded in different structural polymorphs of silver

S. K. Mohanta, Subhrangsu Sarkar, Pushan Ayyub, and S. N. Mishra

Phys. Rev. B 94, 184431 (2016) - Published 28 November, 2016

Direct observation of anisotropic magnetic field response of the spin helix in FeGe thin films

N. Kanazawa, J. S. White, H. M. Rønnow, C. D. Dewhurst, Y. Fujishiro, A. Tsukazaki, Y. Kozuka, M. Kawasaki, M. Ichikawa, F. Kagawa, and Y. Tokura

Phys. Rev. B 94, 184432 (2016) - Published 28 November, 2016

Spiral spin orders often produce various fascinating phenomena via interaction with electronic structures. Examples include, but are not limited to, multiferroicity and skyrmion formation. Among them, a deformed spiral spin structure, which can be viewed as a periodic sequence of 2π spin-rotation kinks, can exhibit the functionality of information transmission owing to its phase coherence. This is the chiral magnetic soliton lattice (CSL). Here, the authors have succeeded in building a spin spiral in a thin film of the chiral magnet FeGe, and revealed its characteristic magnetic responses. Magnetic anisotropy and boundary conditions inherent to the epitaxial thin film secure the alignment of the spiral winding direction along the film normal, even under external magnetic fields. This constraint leads to the anisotropic deformation of the spin spiral with respect to the magnetic field direction. Especially, the CSL, which is realized under an in-plane magnetic field, transforms with field between states with different numbers of kinks. The authors clearly demonstrate the deformation by direct observation of the spiral propagation vector by use of the small-angle neutron scattering technique.

Element-resolved magnetism across the temperature- and pressure-induced spin reorientation in MnBi

Yongseong Choi, Xiujuan Jiang, Wenli Bi, Pavel Lapa, Rajiv K. Chouhan, D. Paudyal, Tamas Varga, Dmitry Popov, Jun Cui, Daniel Haskel, and J. S. Jiang

Phys. Rev. B 94, 184433 (2016) - Published 28 November, 2016

Magnetotransport properties of Fe0.8Ga0.2 films with stripe domains

M. Granada, S. Bustingorry, D. E. Pontello, M. Barturen, M. Eddrief, M. Marangolo, and J. Milano

Phys. Rev. B 94, 184435 (2016) - Published 29 November, 2016

Superfluidity and superconductivity

Gradient flow in the Ginzburg-Landau model of superconductivity

P. Mikula, M. E. Carrington, and G. Kunstatter

Phys. Rev. B 94, 184501 (2016) - Published 3 November, 2016

Crossing fields in thin films of isotropic superconductors

V. K. Vlasko-Vlasov, F. Colauto, A. A. Buzdin, D. Carmo, A. M. H. Andrade, A. A. M. Oliveira, W. A. Ortiz, D. Rosenmann, and W.-K. Kwok

Phys. Rev. B 94, 184502 (2016) - Published 4 November, 2016

Otto refrigerator based on a superconducting qubit: Classical and quantum performance

B. Karimi and J. P. Pekola

Phys. Rev. B 94, 184503 (2016) - Published 9 November, 2016

Experimental demonstration of a truly quantum mechanical solid-state heat engine or refrigerator remains elusive up to now. Here, a four-stroke quantum refrigerator that can be realized using a superconducting qubit coupled alternately to two resonators with embedded reservoirs is analyzed theoretically. Besides being a practically feasible thermal machine, this concept presents a number of fundamentally interesting features. At high frequencies, the system exhibits nearly coherent dynamics, leading to quantum oscillations in cooling power versus operation frequency. At intermediate frequencies, an ideal Otto cycle can be realized. In the nearly adiabatic regime, the cooling power is quadratic in frequency and can be separated to classical and quantum contributions. Interestingly, it is shown here that quantum coherence leads always to performance that is inferior as compared to that arising from purely classical dynamics. Furthermore, in the nearly adiabatic regime the efficiency of the refrigerator exceeds clearly that of the standard Otto cycle.

μSR and magnetometry study of superconducting 5% Pt-doped IrTe2

M. N. Wilson, T. Medina, T. J. Munsie, S. C. Cheung, B. A. Frandsen, L. Liu, J. Yan, D. Mandrus, Y. J. Uemura, and G. M. Luke

Phys. Rev. B 94, 184504 (2016) - Published 11 November, 2016

Inelastic scattering of xenon atoms by quantized vortices in superfluids

I. A. Pshenichnyuk and N. G. Berloff

Phys. Rev. B 94, 184505 (2016) - Published 15 November, 2016

Superconductivity and multiple pressure-induced phases in BaPt2As2

C. Y. Guo, W. B. Jiang, M. Smidman, F. Han, C. D. Malliakas, B. Shen, Y. F. Wang, Y. Chen, X. Lu, M. G. Kanatzidis, and H. Q. Yuan

Phys. Rev. B 94, 184506 (2016) - Published 16 November, 2016

Vortex and disclination structures in a nematic-superconductor state

Daniel G. Barci, Rafael V. Clarim, and N. L. Silva Júnior

Phys. Rev. B 94, 184507 (2016) - Published 16 November, 2016

Understanding and enhancing superconductivity in FeSe/SrTiO3 by quantum size effects

Bruno Murta and Antonio M. García-García

Phys. Rev. B 94, 184508 (2016) - Published 21 November, 2016

Vortex spectroscopy in the vortex glass: A real-space numerical approach

C. Berthod

Phys. Rev. B 94, 184510 (2016) - Published 28 November, 2016

Direct observation of charge order in underdoped and optimally doped Bi2(Sr,La)2CuO6+δ by resonant inelastic x-ray scattering

Y. Y. Peng, M. Salluzzo, X. Sun, A. Ponti, D. Betto, A. M. Ferretti, F. Fumagalli, K. Kummer, M. Le Tacon, X. J. Zhou, N. B. Brookes, L. Braicovich, and G. Ghiringhelli

Phys. Rev. B 94, 184511 (2016) - Published 28 November, 2016

The already overcrowded phase diagram of cuprate superconductors has recently accommodated a region characterized by incommensurate charge density waves (CDW), partly overlapping with superconductivity, and included in the pseudogap regime. Although charge order is strengthened by high magnetic fields and competes with superconductivity, its role in Cooper pairing is still unassessed, calling for more complete characterization in different families of cuprates. The authors present an extensive x-ray scattering study of charge order in single layer La-doped Bi2201, and they show it extends up to optimal-doping (OP33K, p=0.16) in this family too. The CDW peak sharpens at Tc and disappears above the pseudogap onset at temperature T*. They also demonstrate that in the underdoped sample (OD15K, p=0.115) the charge density wave has no out-of-plane correlation and has dominant unidirectional nature within the planes.

Small-scale universality of particle dynamics in quantum turbulence

M. La Mantia, P. Švančara, D. Duda, and L. Skrbek

Phys. Rev. B 94, 184512 (2016) - Published 28 November, 2016

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As2 single crystals

W. T. Jin, Y. Xiao, Z. Bukowski, Y. Su, S. Nandi, A. P. Sazonov, M. Meven, O. Zaharko, S. Demirdis, K. Nemkovski, K. Schmalzl, Lan Maria Tran, Z. Guguchia, E. Feng, Z. Fu, and Th. Brückel

Phys. Rev. B 94, 184513 (2016) - Published 28 November, 2016

Combined resistivity and Hall effect study on NaFe1−xRhxAs single crystals

Frank Steckel, Federico Caglieris, Robert Beck, Maria Roslova, Dirk Bombor, Igor Morozov, Sabine Wurmehl, Bernd Büchner, and Christian Hess

Phys. Rev. B 94, 184514 (2016) - Published 28 November, 2016

Nonequilibrium electron transport in a hybrid superconductor–normal metal entangler in a dissipative environment

Vladimir Bubanja, Mayumi Yamamoto, and Shuichi Iwabuchi

Phys. Rev. B 94, 184515 (2016) - Published 28 November, 2016

Intermediate regime between metal and superconductor below T=100 K in NiSi

Ashutosh Dahal, Jagath Gunasekera, Leland Harriger, S. H. Lee, Y. S. Hor, David J. Singh, and Deepak K. Singh

Phys. Rev. B 94, 184516 (2016) - Published 28 November, 2016

Multichiral ground states in mesoscopic p-wave superconductors

V. Fernández Becerra and M. V. Milošević

Phys. Rev. B 94, 184517 (2016) - Published 30 November, 2016

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