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HIGHLIGHTED ARTICLES

Ferrimagnetic ordering and spin entropy of field-dependent intermediate spins in Na0.82CoO2

G. J. Shu and F. C. Chou

Phys. Rev. B 93, 140402(R) (2016) - Published 5 April, 2016

The authors continue efforts to understand the origin of the peculiar phenomenon revealed in the electronic and magnetic properties of NaxCoO2. From ac and dc spin susceptibility measurements, they confirm the key role of the Co3+ intermediate spin state. This research should also have bearing on other layered transition metal oxides.

Current control of magnetic anisotropy via stress in a ferromagnetic metal waveguide

Kyongmo An, Xin Ma, Chi-Feng Pai, Jusang Yang, Kevin S. Olsson, James L. Erskine, Daniel C. Ralph, Robert A. Buhrman, and Xiaoqin Li

Phys. Rev. B 93, 140404(R) (2016) - Published 11 April, 2016

Current control of magnetism, especially in multilayer thin films, hold great promise for applications in spintronics. Efficient control can be achieved using spin-orbit torques originating from either the spin Hall effect or the Rashba effect. In the context of spin waves, direct current pass through a heavy metal/ferromagnetic bilayer may be used to reduce/amplify damping or shift the resonant field. The effective field or damping introduced by the spin Hall or the Rashba effects depends on the current linearly, reversing the sign with a direct current in the opposite direction. The authors of this study report unexpected symmetric magnetic resonance shifts for spin waves passing through a CoFeB/Ta waveguide. This second-order effect arises from the dc modified magnetic anisotropy via anisotropic stress introduced between the substrate and the bilayer. Similar current-induced magnetoelastic effects may be relevant in many ferromagnetic heterostructures subject to large direct current.

Coexistence of low-moment magnetism and superconductivity in tetragonal FeS and suppression of Tc under pressure

S. Holenstein, U. Pachmayr, Z. Guguchia, S. Kamusella, R. Khasanov, A. Amato, C. Baines, H.-H. Klauss, E. Morenzoni, D. Johrendt, and H. Luetkens

Phys. Rev. B 93, 140506(R) (2016) - Published 25 April, 2016

The family of iron-based superconductors has recently acquired a new member material, FeS. Theoretically, this compound has been shown to have electronic structure similar to that of the superconducting FeSe. However, contradictory ground states have been predicted for FeS. In this work, a collaboration of authors from Switzerland and Germany use muon spin rotation and relaxation to show that weak-moment magnetism microscopically coexists with bulk superconductivity. Additionally, in contrast with some earlier studies, the results suggest a fully gapped superconducting state of FeS.

Asymmetric structure of 90∘ domain walls and interactions with defects in PbTiO3

Anand Chandrasekaran, Xian-Kui Wei, Ludwig Feigl, Dragan Damjanovic, Nava Setter, and Nicola Marzari

Phys. Rev. B 93, 144102 (2016) - Published 4 April, 2016

Using a combination of first-principles calculation and high-resolution scanning TEM, the authors report novel structural characteristics of the ferreoelastic 90∘ domain wall in PbTiO3. They highlight the discovery of a sharp discontinuity in the variation of the lattice parameters across the domain wall. The first-principles calculations show that oxygen vacancies prefer to cluster in the plane adjacent to the asymmetric domain walls. Understanding interaction of oxygen vacancies with domain walls is important because such defects are used to tailor properties of ferroelectric materials

Strain coupling, microstructure dynamics, and acoustic mode softening in germanium telluride

D. Yang, T. Chatterji, J. A. Schiemer, and M. A. Carpenter

Phys. Rev. B 93, 144109 (2016) - Published 11 April, 2016

The authors have used resonant ultrasound spectroscopy to characterize variations in the elastic and anelastic properties of GeTe associated with the ferroelectric/ferroelastic phase transition at ~625 K. These arise as a consequence of strong coupling between strain and driving order parameter, and their magnitudes are permissive of a significant order/disorder component to the transition. Remarkably, precursor softening due to dynamical disorder and Debye freezing of twin walls at low temperatures appear both to be controlled by the same thermally activated mechanism associated with small displacements of Ge within GeTe6 octahedra. This mechanism must also be important in constraining the stability and dynamics with respect to ferroelectric switching.

Stable phase separation and heterogeneity away from the coexistence curve

T. R. Kirkpatrick and D. Belitz

Phys. Rev. B 93, 144203 (2016) - Published 19 April, 2016

Numerous experiments on solids in the vicinity of first-order phase transitions indicate that the two phases can coexist in equilibrium even away from coexistence curve, which seems to defy basic notions of thermodynamics. Examples include the magnetic quantum phase transition in the helical magnet MnSi, and the Mott transition in the rare-earth nickelates. Muon spin rotation experiments show that the volume fraction of the magnetic phase is less than 100% in a region away from the coexistence curve of the first-order phase transition. The authors provide an explanation for these puzzling observations: imperfections in the solid material can lead to small regions in space that locally favor one phase over the other. As a result, the material will not be homogeneous, but rather contain droplets of one phase within the other. These droplets are stable, and last indefinitely. The system thus never attains the equilibrium state one would naively expect, in which all of the volume would be taken up by one of the phases.

Determination of spin torque efficiencies in heterostructures with perpendicular magnetic anisotropy

Chi-Feng Pai, Maxwell Mann, Aik Jun Tan, and Geoffrey S. D. Beach

Phys. Rev. B 93, 144409 (2016) - Published 8 April, 2016

Current-induced spin-orbit torque (SOT) in magnetic heterostructures with perpendicular magnetic anisotropy is an efficient mechanism to control the magnetic moments therein. The authors present a Hall-voltage-based technique that allows them to simultaneously determine two key physical quantities describing SOT in magnetic heterostructures: the SOT efficiency and the magnitude of effective Dzyaloshinskii-Moriya interaction field. With the help of this new technique, the authors find that the spin-orbit torque, apart from the conventional spin-Hall-induced contribution, includes another geometrical component that depends on the shape of the ferromagnetic layer of the heterostructure. This opens a possibility for engineering SOT switching without any aid of external magnetic field, with possible applications for magnetic random access memory applications.

Spin liquid nature in the Heisenberg J1−J2 triangular antiferromagnet

Yasir Iqbal, Wen-Jun Hu, Ronny Thomale, Didier Poilblanc, and Federico Becca

Phys. Rev. B 93, 144411 (2016) - Published 11 April, 2016

The search for unconventional phases of matter, such as quantum spin liquids (QSL), is one of the fundamental and most debated issues in condensed matter physics. While gapped spin liquids have been widely studied and are now accepted to exist in nature, the existence and stability of gapless spin liquids is more controversial. The authors present their analysis of the frustrated antiferromagnetic spin model on a triangular lattice, which has been suggested very recently as a platform to host QSLs. They use a combination of several numerical techniques to show that a gapless spin liquid, which can be described via emergent interacting Dirac fermions, proves to be an excellent candidate ground state to describe the frustrated regime for the spin model.

Confinement of superconducting fluctuations due to emergent electronic inhomogeneities

C. Carbillet, S. Caprara, M. Grilli, C. Brun, T. Cren, F. Debontridder, B. Vignolle, W. Tabis, D. Demaille, L. Largeau, K. Ilin, M. Siegel, D. Roditchev, and B. Leridon

Phys. Rev. B 93, 144509 (2016) - Published 15 April, 2016

How a disordered superconductor evolves into an insulator is still a matter of intense debate. Disorder and reduced screening of Coulomb repulsion may simply break the pairs or, alternatively, the Cooper pairs themselves may localize. Thin disordered NbN films fall between these two extremes and display intermediate scale inhomogeneity with anomalous properties, which are studied by the authors using Scanning Tunneling Spectroscopy and transport measurements. While STS exhibits inhomogeneity at distances much larger the typical size of the nanocrystals constituting the NbN films, the conductivity fluctuations near the superconductor-insulator transition have effectively a zero-dimensional character similar to the one previously found only in granular systems.

RAPID COMMUNICATIONS

Structure, structural phase transitions, mechanical properties, defects

Electronic and magnetic properties of single Fe atoms on a CuN surface: Effects of electron correlations

S. K. Panda, I. Di Marco, O. Grånäs, O. Eriksson, and J. Fransson

Phys. Rev. B 93, 140101(R) (2016) - Published 4 April, 2016

Inhomogeneous, disordered, and partially ordered systems

Size effects on the thermal conductivity of amorphous silicon thin films

Jeffrey L. Braun, Christopher H. Baker, Ashutosh Giri, Mirza Elahi, Kateryna Artyushkova, Thomas E. Beechem, Pamela M. Norris, Zayd C. Leseman, John T. Gaskins, and Patrick E. Hopkins

Phys. Rev. B 93, 140201(R) (2016) - Published 1 April, 2016

Designing a fully compensated half-metallic ferrimagnet

Mario Žic, Karsten Rode, Naganivetha Thiyagarajah, Yong-Chang Lau, Davide Betto, J. M. D. Coey, Stefano Sanvito, Kerry J. O'Shea, Ciaran A. Ferguson, Donald A. MacLaren, and Thomas Archer

Phys. Rev. B 93, 140202(R) (2016) - Published 1 April, 2016

Phase behavior of metastable liquid silicon at negative pressure: Ab initio molecular dynamics

G. Zhao, Y. J. Yu, J. L. Yan, M. C. Ding, X. G. Zhao, and H. Y. Wang

Phys. Rev. B 93, 140203(R) (2016) - Published 5 April, 2016

Anomalous structure-property relationships in metallic glasses through pressure-mediated glass formation

Jun Ding, Mark Asta, and Robert O. Ritchie

Phys. Rev. B 93, 140204(R) (2016) - Published 8 April, 2016

Unconventional spin Hall effect and axial current generation in a Dirac semimetal

Nobuyuki Okuma and Masao Ogata

Phys. Rev. B 93, 140205(R) (2016) - Published 20 April, 2016

Charge transport in disordered semiconducting polymers driven by nuclear tunneling

N. J. van der Kaap, I. Katsouras, K. Asadi, P. W. M. Blom, L. J. A. Koster, and D. M. de Leeuw

Phys. Rev. B 93, 140206(R) (2016) - Published 25 April, 2016

Magnetism

Magnetization dynamics of topological defects and the spin solid in a kagome artificial spin ice

V. S. Bhat, F. Heimbach, I. Stasinopoulos, and D. Grundler

Phys. Rev. B 93, 140401(R) (2016) - Published 5 April, 2016

Ferrimagnetic ordering and spin entropy of field-dependent intermediate spins in Na0.82CoO2

G. J. Shu and F. C. Chou

Phys. Rev. B 93, 140402(R) (2016) - Published 5 April, 2016

The authors continue efforts to understand the origin of the peculiar phenomenon revealed in the electronic and magnetic properties of NaxCoO2. From ac and dc spin susceptibility measurements, they confirm the key role of the Co3+ intermediate spin state. This research should also have bearing on other layered transition metal oxides.

Simultaneous occurrence of multiferroism and short-range magnetic order in DyFeO3

Jinchen Wang, Juanjuan Liu, Jieming Sheng, Wei Luo, Feng Ye, Zhiying Zhao, Xuefeng Sun, Sergey A. Danilkin, Guochu Deng, and Wei Bao

Phys. Rev. B 93, 140403(R) (2016) - Published 6 April, 2016

Current control of magnetic anisotropy via stress in a ferromagnetic metal waveguide

Kyongmo An, Xin Ma, Chi-Feng Pai, Jusang Yang, Kevin S. Olsson, James L. Erskine, Daniel C. Ralph, Robert A. Buhrman, and Xiaoqin Li

Phys. Rev. B 93, 140404(R) (2016) - Published 11 April, 2016

Current control of magnetism, especially in multilayer thin films, hold great promise for applications in spintronics. Efficient control can be achieved using spin-orbit torques originating from either the spin Hall effect or the Rashba effect. In the context of spin waves, direct current pass through a heavy metal/ferromagnetic bilayer may be used to reduce/amplify damping or shift the resonant field. The effective field or damping introduced by the spin Hall or the Rashba effects depends on the current linearly, reversing the sign with a direct current in the opposite direction. The authors of this study report unexpected symmetric magnetic resonance shifts for spin waves passing through a CoFeB/Ta waveguide. This second-order effect arises from the dc modified magnetic anisotropy via anisotropic stress introduced between the substrate and the bilayer. Similar current-induced magnetoelastic effects may be relevant in many ferromagnetic heterostructures subject to large direct current.

Strong reduction of the coercivity by a surface acoustic wave in an out-of-plane magnetized epilayer

L. Thevenard, I. S. Camara, J.-Y. Prieur, P. Rovillain, A. Lemaître, C. Gourdon, and J.-Y. Duquesne

Phys. Rev. B 93, 140405(R) (2016) - Published 11 April, 2016

Magnetic phase diagram of La2−xSrxCoO4 revised using muon-spin relaxation

R. C. Williams, F. Xiao, T. Lancaster, R. De Renzi, G. Allodi, S. Bordignon, P. G. Freeman, F. L. Pratt, S. R. Giblin, J. S. Möller, S. J. Blundell, A. T. Boothroyd, and D. Prabhakaran

Phys. Rev. B 93, 140406(R) (2016) - Published 14 April, 2016

Spin dynamics and two-dimensional correlations in the fcc antiferromagnetic Sr2YRuO6

S. M. Disseler, J. W. Lynn, R. F. Jardim, M. S. Torikachvili, and E. Granado

Phys. Rev. B 93, 140407(R) (2016) - Published 15 April, 2016

Spin liquid state in the disordered triangular lattice Sc2Ga2CuO7 revealed by NMR

P. Khuntia, R. Kumar, A. V. Mahajan, M. Baenitz, and Y. Furukawa

Phys. Rev. B 93, 140408(R) (2016) - Published 18 April, 2016

Identifying multiexcitons in MoS2 monolayers at room temperature

Hyun Seok Lee, Min Su Kim, Hyun Kim, and Young Hee Lee

Phys. Rev. B 93, 140409(R) (2016) - Published 19 April, 2016

Doppler effect in a solid medium: Spin wave emission by a precessing domain wall drifting in spin current

Hong Xia, Jie Chen, Xiaoyan Zeng, and Ming Yan

Phys. Rev. B 93, 140410(R) (2016) - Published 20 April, 2016

Surface vacancy mediated pinning of the magnetization in γ−Fe2O3 nanoparticles: A micromagnetic simulation study

Bassel Alkadour, J. I. Mercer, J. P. Whitehead, J. van Lierop, and B. W. Southern

Phys. Rev. B 93, 140411(R) (2016) - Published 22 April, 2016

Transverse field muon-spin rotation measurement of the topological anomaly in a thin film of MnSi

T. Lancaster, F. Xiao, Z. Salman, I. O. Thomas, S. J. Blundell, F. L. Pratt, S. J. Clark, T. Prokscha, A. Suter, S. L. Zhang, A. A. Baker, and T. Hesjedal

Phys. Rev. B 93, 140412(R) (2016) - Published 25 April, 2016

Constructing a magnetic handle for antiferromagnetic manganites

Artur Glavic, Hemant Dixit, Valentino R. Cooper, and Adam A. Aczel

Phys. Rev. B 93, 140413(R) (2016) - Published 27 April, 2016

Superfluidity and superconductivity

New phase transition in Na2Ti2As2O revealed by Raman scattering

D. Chen, T.-T. Zhang, Z.-D. Song, H. Li, W.-L. Zhang, T. Qian, J.-L. Luo, Y.-G. Shi, Z. Fang, P. Richard, and H. Ding

Phys. Rev. B 93, 140501(R) (2016) - Published 4 April, 2016

Volovik effect and Fermi-liquid behavior in the s-wave superconductor CaPd2As2: As75 NMR-NQR measurements

Q.-P. Ding, P. Wiecki, V. K. Anand, N. S. Sangeetha, Y. Lee, D. C. Johnston, and Y. Furukawa

Phys. Rev. B 93, 140502(R) (2016) - Published 7 April, 2016

Self-organized topological superconductivity in a Yu-Shiba-Rusinov chain

Michael Schecter, Karsten Flensberg, Morten H. Christensen, Brian M. Andersen, and Jens Paaske

Phys. Rev. B 93, 140503(R) (2016) - Published 11 April, 2016

Electronic structure of the ingredient planes of the cuprate superconductor Bi2Sr2CuO6+δ: A comparison study with Bi2Sr2CaCu2O8+δ

Yan-Feng Lv, Wen-Lin Wang, Hao Ding, Yang Wang, Ying Ding, Ruidan Zhong, John Schneeloch, G. D. Gu, Lili Wang, Ke He, Shuai-Hua Ji, Lin Zhao, Xing-Jiang Zhou, Can-Li Song, Xu-Cun Ma, and Qi-Kun Xue

Phys. Rev. B 93, 140504(R) (2016) - Published 15 April, 2016

Composition-induced structural instability and strong-coupling superconductivity in Au1−xPdxTe2

Kazutaka Kudo, Hiroyuki Ishii, and Minoru Nohara

Phys. Rev. B 93, 140505(R) (2016) - Published 25 April, 2016

Coexistence of low-moment magnetism and superconductivity in tetragonal FeS and suppression of Tc under pressure

S. Holenstein, U. Pachmayr, Z. Guguchia, S. Kamusella, R. Khasanov, A. Amato, C. Baines, H.-H. Klauss, E. Morenzoni, D. Johrendt, and H. Luetkens

Phys. Rev. B 93, 140506(R) (2016) - Published 25 April, 2016

The family of iron-based superconductors has recently acquired a new member material, FeS. Theoretically, this compound has been shown to have electronic structure similar to that of the superconducting FeSe. However, contradictory ground states have been predicted for FeS. In this work, a collaboration of authors from Switzerland and Germany use muon spin rotation and relaxation to show that weak-moment magnetism microscopically coexists with bulk superconductivity. Additionally, in contrast with some earlier studies, the results suggest a fully gapped superconducting state of FeS.

ARTICLES

Structure, structural phase transitions, mechanical properties, defects

Transient optical properties of semiconductors under femtosecond x-ray irradiation

Victor Tkachenko, Nikita Medvedev, Zheng Li, Przemysław Piekarz, and Beata Ziaja

Phys. Rev. B 93, 144101 (2016) - Published 1 April, 2016

Asymmetric structure of 90∘ domain walls and interactions with defects in PbTiO3

Anand Chandrasekaran, Xian-Kui Wei, Ludwig Feigl, Dragan Damjanovic, Nava Setter, and Nicola Marzari

Phys. Rev. B 93, 144102 (2016) - Published 4 April, 2016

Using a combination of first-principles calculation and high-resolution scanning TEM, the authors report novel structural characteristics of the ferreoelastic 90∘ domain wall in PbTiO3. They highlight the discovery of a sharp discontinuity in the variation of the lattice parameters across the domain wall. The first-principles calculations show that oxygen vacancies prefer to cluster in the plane adjacent to the asymmetric domain walls. Understanding interaction of oxygen vacancies with domain walls is important because such defects are used to tailor properties of ferroelectric materials

Metastable structure of Li13Si4

Thomas Gruber, Silvia Bahmann, and Jens Kortus

Phys. Rev. B 93, 144104 (2016) - Published 6 April, 2016

Effect of metal cation replacement on the electronic structure of metalorganic halide perovskites: Replacement of lead with alkaline-earth metals

Meysam Pazoki, T. Jesper Jacobsson, Anders Hagfeldt, Gerrit Boschloo, and Tomas Edvinsson

Phys. Rev. B 93, 144105 (2016) - Published 7 April, 2016

Ideal compressive strength of fcc Co, Ni, and Ni-rich alloys along the 〈001〉 direction: A first-principles study

A. Breidi, S. G. Fries, and A. V. Ruban

Phys. Rev. B 93, 144106 (2016) - Published 7 April, 2016

Predicted phase diagram of boron-carbon-nitrogen

Hantao Zhang, Sanxi Yao, and Michael Widom

Phys. Rev. B 93, 144107 (2016) - Published 8 April, 2016

Simultaneous investigation of thermal, acoustic, and magnetic emission during martensitic transformation in single-crystalline Ni2MnGa

László Z. Tóth, Lajos Daróczi, Sándor Szabó, and Dezső L. Beke

Phys. Rev. B 93, 144108 (2016) - Published 11 April, 2016

Strain coupling, microstructure dynamics, and acoustic mode softening in germanium telluride

D. Yang, T. Chatterji, J. A. Schiemer, and M. A. Carpenter

Phys. Rev. B 93, 144109 (2016) - Published 11 April, 2016

The authors have used resonant ultrasound spectroscopy to characterize variations in the elastic and anelastic properties of GeTe associated with the ferroelectric/ferroelastic phase transition at ~625 K. These arise as a consequence of strong coupling between strain and driving order parameter, and their magnitudes are permissive of a significant order/disorder component to the transition. Remarkably, precursor softening due to dynamical disorder and Debye freezing of twin walls at low temperatures appear both to be controlled by the same thermally activated mechanism associated with small displacements of Ge within GeTe6 octahedra. This mechanism must also be important in constraining the stability and dynamics with respect to ferroelectric switching.

A modified embedded-atom method interatomic potential for ionic systems: 2NNMEAM+Qeq

Eunkoo Lee, Kwang-Ryeol Lee, M. I. Baskes, and Byeong-Joo Lee

Phys. Rev. B 93, 144110 (2016) - Published 11 April, 2016

Anharmonicity effects in the frictionlike mode of graphite

C. Menéndez, A. Lobato, D. Abbasi-Pérez, J. Fernández-Núñez, V. G. Baonza, and J. M. Recio

Phys. Rev. B 93, 144112 (2016) - Published 13 April, 2016

Single-domain (110) PbTiO3 thin films: Thermodynamic theory and experiments

M. Mtebwa, A. K. Tagantsev, T. Yamada, P. Gemeiner, B. Dkhil, and N. Setter

Phys. Rev. B 93, 144113 (2016) - Published 14 April, 2016

Floquet Weyl phases in a three-dimensional network model

Hailong Wang, Longwen Zhou, and Y. D. Chong

Phys. Rev. B 93, 144114 (2016) - Published 14 April, 2016

Atomic-level mechanism of elastic deformation in the Zr-Cu metallic glass

J. Antonowicz, A. Pietnoczka, G. A. Evangelakis, O. Mathon, I. Kantor, S. Pascarelli, A. Kartouzian, T. Shinmei, and T. Irifune

Phys. Rev. B 93, 144115 (2016) - Published 15 April, 2016

Quadrupole moments in chiral material DyFe3(BO3)4 observed by resonant x-ray diffraction

Hiroshi Nakajima, Tomoyasu Usui, Yves Joly, Motohiro Suzuki, Yusuke Wakabayashi, Tsuyoshi Kimura, and Yoshikazu Tanaka

Phys. Rev. B 93, 144116 (2016) - Published 18 April, 2016

Lowering of ground state induced by core-shell structure in strontium titanate

J. M. Kiat, B. Hehlen, M. Anoufa, C. Bogicevic, C. Curfs, B. Boyer, M. Al-Sabbagh, F. Porcher, and A. Al-Zein

Phys. Rev. B 93, 144117 (2016) - Published 19 April, 2016

Strain-activated structural anisotropy in BaFe2As2

Xiang Chen, Leland Harriger, Athena Sefat, R. J. Birgeneau, and Stephen D. Wilson

Phys. Rev. B 93, 144118 (2016) - Published 20 April, 2016

Picosecond dynamics of a shock-driven displacive phase transformation in Zr

T. D. Swinburne, M. G. Glavicic, K. M. Rahman, N. G. Jones, J. Coakley, D. E. Eakins, T. G. White, V. Tong, D. Milathianaki, G. J. Williams, D. Rugg, A. P. Sutton, and D. Dye

Phys. Rev. B 93, 144119 (2016) - Published 20 April, 2016

Inhomogeneous, disordered, and partially ordered systems

Computing the dielectric constant of liquid water at constant dielectric displacement

Chao Zhang and Michiel Sprik

Phys. Rev. B 93, 144201 (2016) - Published 5 April, 2016

Local structural excitations in model glass systems under applied load

S. Swayamjyoti, J. F. Löffler, and P. M. Derlet

Phys. Rev. B 93, 144202 (2016) - Published 6 April, 2016

Stable phase separation and heterogeneity away from the coexistence curve

T. R. Kirkpatrick and D. Belitz

Phys. Rev. B 93, 144203 (2016) - Published 19 April, 2016

Numerous experiments on solids in the vicinity of first-order phase transitions indicate that the two phases can coexist in equilibrium even away from coexistence curve, which seems to defy basic notions of thermodynamics. Examples include the magnetic quantum phase transition in the helical magnet MnSi, and the Mott transition in the rare-earth nickelates. Muon spin rotation experiments show that the volume fraction of the magnetic phase is less than 100% in a region away from the coexistence curve of the first-order phase transition. The authors provide an explanation for these puzzling observations: imperfections in the solid material can lead to small regions in space that locally favor one phase over the other. As a result, the material will not be homogeneous, but rather contain droplets of one phase within the other. These droplets are stable, and last indefinitely. The system thus never attains the equilibrium state one would naively expect, in which all of the volume would be taken up by one of the phases.

On the nontrivial wave-vector dependence of the elastic modulus of glasses

Giacomo Baldi, Valentina M. Giordano, Beatrice Ruta, and Giulio Monaco

Phys. Rev. B 93, 144204 (2016) - Published 22 April, 2016

Analysis of electrostatic stability and ordering in quaternary perovskite solid solutions

Clovis Caetano, Keith T. Butler, and Aron Walsh

Phys. Rev. B 93, 144205 (2016) - Published 25 April, 2016

Dynamics, dynamical systems, lattice effects

Crystal dynamics and thermal properties of neptunium dioxide

P. Maldonado, L. Paolasini, P. M. Oppeneer, T. R. Forrest, A. Prodi, N. Magnani, A. Bosak, G. H. Lander, and R. Caciuffo

Phys. Rev. B 93, 144301 (2016) - Published 4 April, 2016

All-coupling theory for the Fröhlich polaron

F. Grusdt

Phys. Rev. B 93, 144302 (2016) - Published 18 April, 2016

Interatomic force constants including the DFT-D dispersion contribution

Benoit Van Troeye, Marc Torrent, and Xavier Gonze

Phys. Rev. B 93, 144304 (2016) - Published 20 April, 2016

Nonequilibrium breakdown of a correlated insulator through pattern formation

Pedro Ribeiro, Andrey E. Antipov, and Alexey N. Rubtsov

Phys. Rev. B 93, 144305 (2016) - Published 25 April, 2016

Slow quenches in a quantum Ising chain: Dynamical phase transitions and topology

Shraddha Sharma, Uma Divakaran, Anatoli Polkovnikov, and Amit Dutta

Phys. Rev. B 93, 144306 (2016) - Published 28 April, 2016

Brillouin-Wigner theory for high-frequency expansion in periodically driven systems: Application to Floquet topological insulators

Takahiro Mikami, Sota Kitamura, Kenji Yasuda, Naoto Tsuji, Takashi Oka, and Hideo Aoki

Phys. Rev. B 93, 144307 (2016) - Published 29 April, 2016

Magnetism

Expansion of the tetragonal magnetic phase with pressure in the iron arsenide superconductor Ba1−xKxFe2As2

E. Hassinger, G. Gredat, F. Valade, S. René de Cotret, O. Cyr-Choinière, A. Juneau-Fecteau, J.-Ph. Reid, H. Kim, M. A. Tanatar, R. Prozorov, B. Shen, H.-H. Wen, N. Doiron-Leyraud, and Louis Taillefer

Phys. Rev. B 93, 144401 (2016) - Published 1 April, 2016

Linear spin-wave study of a quantum kagome ice

S. A. Owerre, A. A. Burkov, and Roger G. Melko

Phys. Rev. B 93, 144402 (2016) - Published 1 April, 2016

Fermi surfaces, spin-mixing parameter, and colossal anisotropy of spin relaxation in transition metals from ab initio theory

Bernd Zimmermann, Phivos Mavropoulos, Nguyen H. Long, Christian-Roman Gerhorst, Stefan Blügel, and Yuriy Mokrousov

Phys. Rev. B 93, 144403 (2016) - Published 4 April, 2016

Electronic correlation and magnetism in the ferromagnetic metal Fe3GeTe2

Jian-Xin Zhu, Marc Janoschek, D. S. Chaves, J. C. Cezar, Tomasz Durakiewicz, Filip Ronning, Yasmine Sassa, Martin Mansson, B. L. Scott, N. Wakeham, Eric D. Bauer, and J. D. Thompson

Phys. Rev. B 93, 144404 (2016) - Published 5 April, 2016

Magnetocrystalline anisotropy of Fe and Co slabs and clusters on SrTiO3 by first-principles

Dongzhe Li, Cyrille Barreteau, and Alexander Smogunov

Phys. Rev. B 93, 144405 (2016) - Published 5 April, 2016

Exchange-bias-like effect of an uncompensated antiferromagnet

Bastian Henne, Verena Ney, Mariano de Souza, and Andreas Ney

Phys. Rev. B 93, 144406 (2016) - Published 6 April, 2016

Sample independence of magnetoelastic excitations in the rare-earth pyrochlore Tb2Ti2O7

M. Ruminy, L. Bovo, E. Pomjakushina, M. K. Haas, U. Stuhr, A. Cervellino, R. J. Cava, M. Kenzelmann, and T. Fennell

Phys. Rev. B 93, 144407 (2016) - Published 6 April, 2016

Deterministic drift instability and stochastic thermal perturbations of magnetic dissipative droplet solitons

P. Wills, E. Iacocca, and M. A. Hoefer

Phys. Rev. B 93, 144408 (2016) - Published 7 April, 2016

Determination of spin torque efficiencies in heterostructures with perpendicular magnetic anisotropy

Chi-Feng Pai, Maxwell Mann, Aik Jun Tan, and Geoffrey S. D. Beach

Phys. Rev. B 93, 144409 (2016) - Published 8 April, 2016

Current-induced spin-orbit torque (SOT) in magnetic heterostructures with perpendicular magnetic anisotropy is an efficient mechanism to control the magnetic moments therein. The authors present a Hall-voltage-based technique that allows them to simultaneously determine two key physical quantities describing SOT in magnetic heterostructures: the SOT efficiency and the magnitude of effective Dzyaloshinskii-Moriya interaction field. With the help of this new technique, the authors find that the spin-orbit torque, apart from the conventional spin-Hall-induced contribution, includes another geometrical component that depends on the shape of the ferromagnetic layer of the heterostructure. This opens a possibility for engineering SOT switching without any aid of external magnetic field, with possible applications for magnetic random access memory applications.

Chaotic dynamics of magnetic domain walls in nanowires

A. Pivano and V. O. Dolocan

Phys. Rev. B 93, 144410 (2016) - Published 11 April, 2016

Spin liquid nature in the Heisenberg J1−J2 triangular antiferromagnet

Yasir Iqbal, Wen-Jun Hu, Ronny Thomale, Didier Poilblanc, and Federico Becca

Phys. Rev. B 93, 144411 (2016) - Published 11 April, 2016

The search for unconventional phases of matter, such as quantum spin liquids (QSL), is one of the fundamental and most debated issues in condensed matter physics. While gapped spin liquids have been widely studied and are now accepted to exist in nature, the existence and stability of gapless spin liquids is more controversial. The authors present their analysis of the frustrated antiferromagnetic spin model on a triangular lattice, which has been suggested very recently as a platform to host QSLs. They use a combination of several numerical techniques to show that a gapless spin liquid, which can be described via emergent interacting Dirac fermions, proves to be an excellent candidate ground state to describe the frustrated regime for the spin model.

Acoustic signatures of the phases and phase transitions in Yb2Ti2O7

Subhro Bhattacharjee, S. Erfanifam, E. L. Green, M. Naumann, Zhaosheng Wang, S. Granovsky, M. Doerr, J. Wosnitza, A. A. Zvyagin, R. Moessner, A. Maljuk, S. Wurmehl, B. Büchner, and S. Zherlitsyn

Phys. Rev. B 93, 144412 (2016) - Published 12 April, 2016

Field-induced multiple order-by-disorder state selection in an antiferromagnetic honeycomb bilayer lattice

F. A. Gómez Albarracín and H. D. Rosales

Phys. Rev. B 93, 144413 (2016) - Published 14 April, 2016

Disorder-promoted C4-symmetric magnetic order in iron-based superconductors

Mareike Hoyer, Rafael M. Fernandes, Alex Levchenko, and Jörg Schmalian

Phys. Rev. B 93, 144414 (2016) - Published 18 April, 2016

Ferromagnetic resonance phase imaging in spin Hall multilayers

Feng Guo, Jason M. Bartell, and Gregory D. Fuchs

Phys. Rev. B 93, 144415 (2016) - Published 18 April, 2016

Reaction diffusion dynamics and the Schryer-Walker solution for domain walls of the Landau-Lifshitz-Gilbert equation

R. D. Benguria and M. C. Depassier

Phys. Rev. B 93, 144416 (2016) - Published 21 April, 2016

Strain-induced perpendicular magnetic anisotropy in La2CoMnO6−ɛ thin films and its dependence on film thickness

Regina Galceran, Laura López-Mir, Bernat Bozzo, José Cisneros-Fernández, José Santiso, Lluís Balcells, Carlos Frontera, and Benjamín Martínez

Phys. Rev. B 93, 144417 (2016) - Published 22 April, 2016

Hubbard models with nearly flat bands: Ground-state ferromagnetism driven by kinetic energy

Patrick Müller, Johannes Richter, and Oleg Derzhko

Phys. Rev. B 93, 144418 (2016) - Published 22 April, 2016

Determination of the zero-field magnetic structure of the helimagnet MnSi at low temperature

P. Dalmas de Réotier, A. Maisuradze, A. Yaouanc, B. Roessli, A. Amato, D. Andreica, and G. Lapertot

Phys. Rev. B 93, 144419 (2016) - Published 22 April, 2016

Ultrahigh cooperativity interactions between magnons and resonant photons in a YIG sphere

J. Bourhill, N. Kostylev, M. Goryachev, D. L. Creedon, and M. E. Tobar

Phys. Rev. B 93, 144420 (2016) - Published 25 April, 2016

Oxidation-induced spin reorientation in Co adatoms and CoPd dimers on Ni/Cu(100)

K. Chen, T. Beeck, S. Fiedler, I. Baev, W. Wurth, and M. Martins

Phys. Rev. B 93, 144421 (2016) - Published 27 April, 2016

Quantum tunneling of the magnetic moment in the S/F/S Josephson φ0 junction

Eugene M. Chudnovsky

Phys. Rev. B 93, 144422 (2016) - Published 27 April, 2016

Phase-resolved ferromagnetic resonance using a heterodyne detection method

Seungha Yoon, Jason Liu, and Robert D. McMichael

Phys. Rev. B 93, 144423 (2016) - Published 28 April, 2016

Superfluidity and superconductivity

Role of the upper branch of the hour-glass magnetic spectrum in the formation of the main kink in the electronic dispersion of high-Tc cuprate superconductors

Dominique Geffroy, Jiří Chaloupka, Thomas Dahm, and Dominik Munzar

Phys. Rev. B 93, 144501 (2016) - Published 1 April, 2016

Single-gap superconductivity in β−Bi2Pd

J. Kačmarčík, Z. Pribulová, T. Samuely, P. Szabó, V. Cambel, J. Šoltýs, E. Herrera, H. Suderow, A. Correa-Orellana, D. Prabhakaran, and P. Samuely

Phys. Rev. B 93, 144502 (2016) - Published 5 April, 2016

Disorder-induced two-step melting of vortex matter in Co-intercalated NbSe2 single crystals

Somesh Chandra Ganguli, Harkirat Singh, Indranil Roy, Vivas Bagwe, Dibyendu Bala, Arumugam Thamizhavel, and Pratap Raychaudhuri

Phys. Rev. B 93, 144503 (2016) - Published 6 April, 2016

Isotope effect on electron-phonon interaction in the multiband superconductor MgB2

Daixiang Mou, Soham Manni, Valentin Taufour, Yun Wu, Lunan Huang, S. L. Bud'ko, P. C. Canfield, and Adam Kaminski

Phys. Rev. B 93, 144504 (2016) - Published 7 April, 2016

Multiband superconductivity and large anisotropy in FeS crystals

Hai Lin, Yufeng Li, Qiang Deng, Jie Xing, Jianzhong Liu, Xiyu Zhu, Huan Yang, and Hai-Hu Wen

Phys. Rev. B 93, 144505 (2016) - Published 7 April, 2016

Theory of light-enhanced phonon-mediated superconductivity

M. A. Sentef, A. F. Kemper, A. Georges, and C. Kollath

Phys. Rev. B 93, 144506 (2016) - Published 8 April, 2016

Nematic quantum liquid crystals of bosons in frustrated lattices

Guanyu Zhu, Jens Koch, and Ivar Martin

Phys. Rev. B 93, 144508 (2016) - Published 15 April, 2016

Confinement of superconducting fluctuations due to emergent electronic inhomogeneities

C. Carbillet, S. Caprara, M. Grilli, C. Brun, T. Cren, F. Debontridder, B. Vignolle, W. Tabis, D. Demaille, L. Largeau, K. Ilin, M. Siegel, D. Roditchev, and B. Leridon

Phys. Rev. B 93, 144509 (2016) - Published 15 April, 2016

How a disordered superconductor evolves into an insulator is still a matter of intense debate. Disorder and reduced screening of Coulomb repulsion may simply break the pairs or, alternatively, the Cooper pairs themselves may localize. Thin disordered NbN films fall between these two extremes and display intermediate scale inhomogeneity with anomalous properties, which are studied by the authors using Scanning Tunneling Spectroscopy and transport measurements. While STS exhibits inhomogeneity at distances much larger the typical size of the nanocrystals constituting the NbN films, the conductivity fluctuations near the superconductor-insulator transition have effectively a zero-dimensional character similar to the one previously found only in granular systems.

Effects of single- and multi-substituted Zn ions in doped 122-type iron-based superconductors

YuanYuan Zhao, Bo Li, Wei Li, Hong-Yi Chen, Kevin E. Bassler, and C. S. Ting

Phys. Rev. B 93, 144510 (2016) - Published 19 April, 2016

Subgap states in disordered superconductors with strong magnetic impurities

Yakov V. Fominov and Mikhail A. Skvortsov

Phys. Rev. B 93, 144511 (2016) - Published 20 April, 2016

Photonic heat conduction in Josephson-coupled Bardeen-Cooper-Schrieffer superconductors

R. Bosisio, P. Solinas, A. Braggio, and F. Giazotto

Phys. Rev. B 93, 144512 (2016) - Published 21 April, 2016

Theoretical study on the anisotropic electronic structure of antiferromagnetic BaFe2As2 and Co-doped Ba(Fe1−xCox)2As2 as seen by angle-resolved photoemission

Gerald Derondeau, Jürgen Braun, Hubert Ebert, and Ján Minár

Phys. Rev. B 93, 144513 (2016) - Published 25 April, 2016

Pressure-induced reemergence of superconductivity in topological insulator Sr0.065Bi2Se3

Yonghui Zhou, Xuliang Chen, Ranran Zhang, Jifeng Shao, Xuefei Wang, Chao An, Ying Zhou, Changyong Park, Wei Tong, Li Pi, Zhaorong Yang, Changjin Zhang, and Yuheng Zhang

Phys. Rev. B 93, 144514 (2016) - Published 26 April, 2016

Doubling of the critical temperature of FeSe observed in point contacts

Yu. G. Naidyuk, G. Fuchs, D. A. Chareev, and A. N. Vasiliev

Phys. Rev. B 93, 144515 (2016) - Published 28 April, 2016

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