Volume 80, Issue 17

1 November 2009

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HIGHLIGHTED ARTICLES

EDITORS' SUGGESTION

Anisotropy barrier reduction in fast-relaxing ${Mn}_{12}$ single-molecule magnets

Stephen Hill, Muralee Murugesu, and George Christou

Phys. Rev. B 80, 174416 (2009) - Published 18 November, 2009

EDITORS' SUGGESTION

Unconventional electronic reconstruction in undoped $(Ba, Sr) {Fe}_{2} {As}_{2}$ across the spin density wave transition

M. Yi, D. H. Lu, J. G. Analytis, J.-H. Chu, S.-K. Mo, R.-H. He, M. Hashimoto, R. G. Moore, I. I. Mazin, D. J. Singh, Z. Hussain, I. R. Fisher, and Z.-X. Shen

Phys. Rev. B 80, 174510 (2009) - Published 9 November, 2009

BRIEF REPORTS

Structure, structural phase transitions, mechanical properties, defects

Proton-irradiation-induced anomaly in the electrical conductivity of a hydrogen-bonded ferroelastic system

Se-Hun Kim, Kyu Won Lee, Kwang-Sei Lee, and Cheol Eui Lee

Phys. Rev. B 80, 172101 (2009) - Published 3 November, 2009

Relationship between low-temperature boson heat capacity peak and high-temperature shear modulus relaxation in a metallic glass

A. N. Vasiliev, T. N. Voloshok, A. V. Granato, D. M. Joncich, Yu. P. Mitrofanov, and V. A. Khonik

Phys. Rev. B 80, 172102 (2009) - Published 4 November, 2009

Magnetoelectric coupling in polycrystalline ${FeVO}_{4}$

Bohdan Kundys, Christine Martin, and Charles Simon

Phys. Rev. B 80, 172103 (2009) - Published 11 November, 2009

High-pressure Raman and x-ray diffraction studies on ${LaB}_{6}$

B. K. Godwal, E. A. Petruska, S. Speziale, J. Yan, S. M. Clark, M. B. Kruger, and R. Jeanloz

Phys. Rev. B 80, 172104 (2009) - Published 19 November, 2009

Inhomogeneous, disordered, and partially ordered systems

Fragility and elasticity: Description of flow in highly viscous liquids

U. Buchenau

Phys. Rev. B 80, 172201 (2009) - Published 25 November, 2009

Dynamics, dynamical systems, lattice effects, quantum solids

Reversal of thermal rectification in quantum systems

Lifa Zhang, Yonghong Yan, Chang-Qin Wu, Jian-Sheng Wang, and Baowen Li

Phys. Rev. B 80, 172301 (2009) - Published 12 November, 2009

Zero-point divacancy concentration in the shadow wave function model for solid ${}^{4}H e$

R. Pessoa, M. de Koning, and S. A. Vitiello

Phys. Rev. B 80, 172302 (2009) - Published 16 November, 2009

Magnetism

Measuring the magnetization of three monolayer thick Co islands and films by x-ray dichroism

A. Mascaraque, L. Aballe, J. F. Marco, T. O. Menteş, F. El Gabaly, C. Klein, A. K. Schmid, K. F. McCarty, A. Locatelli, and J. de la Figuera

Phys. Rev. B 80, 172401 (2009) - Published 6 November, 2009

Origin of electric-field-induced modification of magnetocrystalline anisotropy at Fe(001) surfaces: Mechanism of dipole formation from first principles

Kohji Nakamura, Riki Shimabukuro, Toru Akiyama, Tomonori Ito, and A. J. Freeman

Phys. Rev. B 80, 172402 (2009) - Published 6 November, 2009

Spontaneous generation of voltage in the magnetocaloric compound $La {({Fe}_{0.88} {Si}_{0.12})}_{13}$ and comparison to ${SmMn}_{2} {Ge}_{2}$

M. Zou, J. A. Sampaio, V. K. Pecharsky, and K. A. Gschneidner, Jr.

Phys. Rev. B 80, 172403 (2009) - Published 17 November, 2009

Toroidal moment in the molecular magnet $V_{15}$

A. K. Zvezdin, V. V. Kostyuchenko, A. I. Popov, A. F. Popkov, and A. Ceulemans

Phys. Rev. B 80, 172404 (2009) - Published 19 November, 2009

Origin of the long-wavelength magnetic modulation in ${Ca}_{3} {Co}_{2} O_{6}$

L. C. Chapon

Phys. Rev. B 80, 172405 (2009) - Published 23 November, 2009

Superfluidity and superconductivity

Anisotropic inelastic scattering and its interplay with superconductivity in ${URu}_{2} {Si}_{2}$

Zengwei Zhu, Elena Hassinger, Zhu’an Xu, Dai Aoki, Jacques Flouquet, and Kamran Behnia

Phys. Rev. B 80, 172501 (2009) - Published 2 November, 2009

Impurity resonance peaks in the vortex core of cuprate superconductors with induced spin density wave order

Wonkee Kim, Yan Chen, and C. S. Ting

Phys. Rev. B 80, 172502 (2009) - Published 3 November, 2009

Three-band $s \pm$ Eliashberg theory and the superconducting gaps of iron pnictides

G. A. Ummarino, M. Tortello, D. Daghero, and R. S. Gonnelli

Phys. Rev. B 80, 172503 (2009) - Published 11 November, 2009

Observation of a coherent optical phonon in the iron pnictide superconductor $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ ( $x = 0.06$ and 0.08)

B. Mansart, D. Boschetto, A. Savoia, F. Rullier-Albenque, A. Forget, D. Colson, A. Rousse, and M. Marsi

Phys. Rev. B 80, 172504 (2009) - Published 16 November, 2009

Validity of the spin-susceptibility “glue” approximation for pairing in the two-dimensional Hubbard model

E. Khatami, A. Macridin, and M. Jarrell

Phys. Rev. B 80, 172505 (2009) - Published 25 November, 2009

One- and two-photon spectroscopy of a flux qubit coupled to a microscopic defect

A. Lupaşcu, P. Bertet, E. F. C. Driessen, C. J. P. M. Harmans, and J. E. Mooij

Phys. Rev. B 80, 172506 (2009) - Published 30 November, 2009

ARTICLES

Structure, structural phase transitions, mechanical properties, defects

Predicted structure and stability of $A_{4} B_{3} O_{12}$ $δ$ -phase compositions

C. R. Stanek, C. Jiang, B. P. Uberuaga, K. E. Sickafus, A. R. Cleave, and R. W. Grimes

Phys. Rev. B 80, 174101 (2009) - Published 2 November, 2009

Finding the low-energy structures of Si[001] symmetric tilted grain boundaries with a genetic algorithm

Jian Zhang, Cai-Zhuang Wang, and Kai-Ming Ho

Phys. Rev. B 80, 174102 (2009) - Published 4 November, 2009

Damping and decoherence of a nanomechanical resonator due to a few two-level systems

Laura G. Remus, Miles P. Blencowe, and Yukihiro Tanaka

Phys. Rev. B 80, 174103 (2009) - Published 4 November, 2009

Structure of self-interstitial atom clusters in iron and copper

Akiyuki Takahashi and Nasr M. Ghoniem

Phys. Rev. B 80, 174104 (2009) - Published 5 November, 2009

Preferential stability of the d-BCT phase in ZnO thin films

Benjamin J. Morgan

Phys. Rev. B 80, 174105 (2009) - Published 10 November, 2009

Quantitative comparisons of contrast in experimental and simulated bright-field scanning transmission electron microscopy images

James M. LeBeau, Adrian J. D’Alfonso, Scott D. Findlay, Susanne Stemmer, and Leslie J. Allen

Phys. Rev. B 80, 174106 (2009) - Published 10 November, 2009

Tricritical Lifshitz point in the temperature-pressure-composition diagram for ${({Pb}_{y} {Sn}_{1 - y})}_{2} P_{2} {({Se}_{x} S_{1 - x})}_{6}$ ferroelectrics

O. Andersson, O. Chobal, I. Rizak, and V. Rizak

Phys. Rev. B 80, 174107 (2009) - Published 11 November, 2009

Formation mechanism of a faceted interface: In situ observation of the Si(100) crystal-melt interface during crystal growth

M. Tokairin, K. Fujiwara, K. Kutsukake, N. Usami, and K. Nakajima

Phys. Rev. B 80, 174108 (2009) - Published 12 November, 2009

Nuclear magnetic resonance study of Li implanted in a thin film of niobium

T. J. Parolin, J. Shi, Z. Salman, K. H. Chow, P. Dosanjh, H. Saadaoui, Q. Song, M. D. Hossain, R. F. Kiefl, C. D. P. Levy, M. R. Pearson, and W. A. MacFarlane

Phys. Rev. B 80, 174109 (2009) - Published 13 November, 2009

Transferred hyperfine interactions for ${Yb}^{3 +}$ ions in $Cs Ca F_{3}$ and ${Cs}_{2} Na Y F_{6}$ single crystals: Experimental and ab initio study

M. L. Falin, O. A. Anikeenok, V. A. Latypov, N. M. Khaidukov, F. Callens, H. Vrielinck, and A. Hoefstaetter

Phys. Rev. B 80, 174110 (2009) - Published 13 November, 2009

Carbon nitride: Ab initio investigation of carbon-rich phases

Judy N. Hart, Frederik Claeyssens, Neil L. Allan, and Paul W. May

Phys. Rev. B 80, 174111 (2009) - Published 17 November, 2009

Picosecond ultrasonic measurements of attenuation of longitudinal acoustic phonons in silicon

B. C. Daly, K. Kang, Y. Wang, and David G. Cahill

Phys. Rev. B 80, 174112 (2009) - Published 19 November, 2009

Nucleation and first-stage growth processes of extrinsic defects in GaAs triggered by self-interstitials

F. Gala and G. Zollo

Phys. Rev. B 80, 174113 (2009) - Published 19 November, 2009

Accurate Hartree-Fock energy of extended systems using large Gaussian basis sets

Joachim Paier, Cristian V. Diaconu, Gustavo E. Scuseria, Manuel Guidon, Joost VandeVondele, and Jürg Hutter

Phys. Rev. B 80, 174114 (2009) - Published 20 November, 2009

Anisotropic dynamics of a vicinal surface under the meandering step instability

Alberto D. Verga

Phys. Rev. B 80, 174115 (2009) - Published 24 November, 2009

Temperature and electric field tuning of the ferroelectric soft mode in a strained ${SrTiO}_{3} / {DyScO}_{3}$ heterostructure

C. Kadlec, V. Skoromets, F. Kadlec, H. Němec, J. Hlinka, J. Schubert, G. Panaitov, and P. Kužel

Phys. Rev. B 80, 174116 (2009) - Published 25 November, 2009

Thermodynamics of hydrogen vacancies in ${MgH}_{2}$ from first-principles calculations and grand-canonical statistical mechanics

R. Grau-Crespo, K. C. Smith, T. S. Fisher, N. H. de Leeuw, and U. V. Waghmare

Phys. Rev. B 80, 174117 (2009) - Published 25 November, 2009

Asymmetric grain distribution in phthalocyanine thin films

K. Paul Gentry, Thomas Gredig, and Ivan K. Schuller

Phys. Rev. B 80, 174118 (2009) - Published 30 November, 2009

Inhomogeneous, disordered, and partially ordered systems

Randomness-induced redistribution of vibrational frequencies in amorphous solids

Valery Ilyin, Itamar Procaccia, Ido Regev, and Yair Shokef

Phys. Rev. B 80, 174201 (2009) - Published 3 November, 2009

Annealing effect on the reduction of Fermi-level density of states in CoTiSb: NMR evidence

C. S. Lue, C. F. Chen, Fu-Kuo Chiang, and M.-W. Chu

Phys. Rev. B 80, 174202 (2009) - Published 5 November, 2009

Polymerization effects and localized electronic states in condensed-phase eumelanin

L. Sangaletti, P. Borghetti, P. Ghosh, S. Pagliara, P. Vilmercati, C. Castellarin-Cudia, L. Floreano, A. Cossaro, A. Verdini, R. Gebauer, and A. Goldoni

Phys. Rev. B 80, 174203 (2009) - Published 17 November, 2009

Inhomogeneity and glass-forming ability in the bulk metallic glass ${Pd}_{42.5} {Ni}_{7.5} {Cu}_{30} P_{20}$ as seen via x-ray spectroscopies

S. Hosokawa, H. Sato, T. Ichitsubo, M. Nakatake, N. Happo, J.-F. Bérar, N. Boudet, T. Usuki, W.-C. Pilgrim, E. Matsubara, and N. Nishiyama

Phys. Rev. B 80, 174204 (2009) - Published 17 November, 2009

Localization-delocalization transitions in a two-dimensional quantum percolation model: von Neumann entropy studies

Longyan Gong and Peiqing Tong

Phys. Rev. B 80, 174205 (2009) - Published 20 November, 2009

Dynamics, dynamical systems, lattice effects, quantum solids

One-dimensional nanostructure-guided chain reactions: Harmonic and anharmonic interactions

Nitish Nair and Michael S. Strano

Phys. Rev. B 80, 174301 (2009) - Published 13 November, 2009

Ab initio construction of interatomic potentials for uranium dioxide across all interatomic distances

P. Tiwary, A. van de Walle, and N. Grønbech-Jensen

Phys. Rev. B 80, 174302 (2009) - Published 25 November, 2009

Design and characterization of broadband acoustic composite metamaterials

Bogdan-Ioan Popa and Steven A. Cummer

Phys. Rev. B 80, 174303 (2009) - Published 25 November, 2009

Magnetism

Spin excitations in the excitonic spin-density-wave state of the iron pnictides

P. M. R. Brydon and C. Timm

Phys. Rev. B 80, 174401 (2009) - Published 3 November, 2009

Magnetic cylindrical nanowires with single modulated diameter

S. Allende, D. Altbir, and K. Nielsch

Phys. Rev. B 80, 174402 (2009) - Published 9 November, 2009

Quantum phase transition in the four-spin exchange antiferromagnet

Valeri N. Kotov, Dao-Xin Yao, A. H. Castro Neto, and D. K. Campbell

Phys. Rev. B 80, 174403 (2009) - Published 10 November, 2009

Current-induced dynamics in noncollinear dual spin valves

P. Baláž, M. Gmitra, and J. Barnaś

Phys. Rev. B 80, 174404 (2009) - Published 11 November, 2009

Spin-torque-induced switching and precession in fully epitaxial Fe/MgO/Fe magnetic tunnel junctions

Rie Matsumoto, Akio Fukushima, Kay Yakushiji, Satoshi Yakata, Taro Nagahama, Hitoshi Kubota, Toshikazu Katayama, Yoshishige Suzuki, Koji Ando, Shinji Yuasa, Benoit Georges, Vincent Cros, Julie Grollier, and Albert Fert

Phys. Rev. B 80, 174405 (2009) - Published 12 November, 2009

Prediction of electrically induced magnetic reconstruction at the manganite/ferroelectric interface

J. D. Burton and E. Y. Tsymbal

Phys. Rev. B 80, 174406 (2009) - Published 13 November, 2009

In-plane spin reorientation transition in a two-dimensional ferromagnetic/antiferromagnetic system studied using Monte Carlo simulations

J. H. Seok, H. Y. Kwon, S. S. Hong, Y. Z. Wu, Z. Q. Qiu, and C. Won

Phys. Rev. B 80, 174407 (2009) - Published 13 November, 2009

Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system $Cu (Cl, Br) La {(Nb, Ta)}_{2} O_{7}$ : Evolution from spin-gap to antiferromagnetic state

Y. J. Uemura, A. A. Aczel, Y. Ajiro, J. P. Carlo, T. Goko, D. A. Goldfeld, A. Kitada, G. M. Luke, G. J. MacDougall, I. G. Mihailescu, J. A. Rodriguez, P. L. Russo, Y. Tsujimoto, C. R. Wiebe, T. J. Williams, T. Yamamoto, K. Yoshimura, and H. Kageyama

Phys. Rev. B 80, 174408 (2009) - Published 13 November, 2009

Quantum phase transition in $(CuCl) La {({Nb}_{1 - x} {Ta}_{x})}_{2} O_{7}$

A. Kitada, Y. Tsujimoto, H. Kageyama, Y. Ajiro, M. Nishi, Y. Narumi, K. Kindo, M. Ichihara, Y. Ueda, Y. J. Uemura, and K. Yoshimura

Phys. Rev. B 80, 174409 (2009) - Published 13 November, 2009

Spontaneous antiferromagnetic long-range order in the two-dimensional hybrid model of localized Ising spins and itinerant electrons

Jozef Strečka, Akinori Tanaka, Lucia Čanová, and Taras Verkholyak

Phys. Rev. B 80, 174410 (2009) - Published 16 November, 2009

Electrical resistivity and magnetoresistance of single-crystal ${Tb}_{5} {Si}_{2.2} {Ge}_{1.8}$

M. Zou, V. K. Pecharsky, K. A. Gschneidner, Jr., Ya. Mudryk, D. L. Schlagel, and T. A. Lograsso

Phys. Rev. B 80, 174411 (2009) - Published 16 November, 2009

Large extraordinary Hall effect and anomalous scaling relations between the Hall and longitudinal conductivities in $ε {-Fe}_{3} N$ nanocrystalline films

Y. H. Cheng, R. K. Zheng, Hui Liu, Yong Tian, and Z. Q. Li

Phys. Rev. B 80, 174412 (2009) - Published 17 November, 2009

Low-temperature study of field-induced antiferromagnetic-ferromagnetic transition in Pd-doped Fe-Rh

Pallavi Kushwaha, Archana Lakhani, R. Rawat, and P. Chaddah

Phys. Rev. B 80, 174413 (2009) - Published 17 November, 2009

Magnetic and electronic properties of ${Eu}_{1 - x} {Sr}_{x} {MnO}_{3}$ $(0.3 < x < 0.7)$ single crystals

Y. Tomioka, R. Kumai, T. Ito, and Y. Tokura

Phys. Rev. B 80, 174414 (2009) - Published 17 November, 2009

Temperature, magnetic field, and pressure dependence of the crystal and magnetic structures of the magnetocaloric compound ${Mn}_{1.1} {Fe}_{0.9} (P_{0.8} {Ge}_{0.2})$

D. M. Liu, Q. Z. Huang, M. Yue, J. W. Lynn, L. J. Liu, Y. Chen, Z. H. Wu, and J. X. Zhang

Phys. Rev. B 80, 174415 (2009) - Published 17 November, 2009

EDITORS' SUGGESTION

Anisotropy barrier reduction in fast-relaxing ${Mn}_{12}$ single-molecule magnets

Stephen Hill, Muralee Murugesu, and George Christou

Phys. Rev. B 80, 174416 (2009) - Published 18 November, 2009

Quantum phase transition of the one-dimensional transverse-field compass model

Ke-Wei Sun and Qing-Hu Chen

Phys. Rev. B 80, 174417 (2009) - Published 20 November, 2009

Transition from spin-density-wave to layered antiferromagnetic state induced by hydrogen as a test for the origin of spin-density waves in chromium

V. M. Uzdin, H. Zabel, A. Remhof, and B. Hjörvarsson

Phys. Rev. B 80, 174418 (2009) - Published 20 November, 2009

Mechanism of exchange bias for isolated nanoparticles embedded in an antiferromagnetic matrix

Valera P. Shcherbakov, Karl Fabian, and Suzanne A. McEnroe

Phys. Rev. B 80, 174419 (2009) - Published 20 November, 2009

Ab initio derivation of the low-energy model for alkali-cluster-loaded sodalites

Kazuma Nakamura, Takashi Koretsune, and Ryotaro Arita

Phys. Rev. B 80, 174420 (2009) - Published 23 November, 2009

Interaction effects on microwave-assisted switching of ${Ni}_{80} {Fe}_{20}$ nanowires in densely packed arrays

Jesco Topp, Detlef Heitmann, and Dirk Grundler

Phys. Rev. B 80, 174421 (2009) - Published 24 November, 2009

Nagaoka ferromagnetism in large-spin fermionic and bosonic systems

Seiji Miyashita, Masao Ogata, and Hans De Raedt

Phys. Rev. B 80, 174422 (2009) - Published 24 November, 2009

${MnSi}_{1.7}$ nanoparticles embedded in Si: Superparamagnetism with collective behavior

Shengqiang Zhou (周生强), Artem Shalimov, Kay Potzger, Manfred Helm, Jürgen Fassbender, and Heidemarie Schmidt

Phys. Rev. B 80, 174423 (2009) - Published 25 November, 2009

Magnetic structure of ${EuFe}_{2} {As}_{2}$ determined by single-crystal neutron diffraction

Y. Xiao, Y. Su, M. Meven, R. Mittal, C. M. N. Kumar, T. Chatterji, S. Price, J. Persson, N. Kumar, S. K. Dhar, A. Thamizhavel, and Th. Brueckel

Phys. Rev. B 80, 174424 (2009) - Published 25 November, 2009

Magnetic properties resulting from core-shell interactions in nanosized ${Ni}_{0.25} {Co}_{0.25} {Zn}_{0.5} {Fe}_{2} O_{4}$

N. Lakshmi, Hina Bhargava, O. P. Suwalka, K. Venugopalan, Varkey Sebastian, V. R. Reddy, and Ajay Gupta

Phys. Rev. B 80, 174425 (2009) - Published 25 November, 2009

Metal-metal transition in perovskite ${PbRuO}_{3}$

J.-G. Cheng, J.-S. Zhou, and J. B. Goodenough

Phys. Rev. B 80, 174426 (2009) - Published 30 November, 2009

Evidence for high- $T_{c}$ ferromagnetism in ${Zn}_{x} {(ZnO)}_{1 - x}$ granular films mediated by native point defects

X. Zhang, Y. H. Cheng, L. Y. Li, Hui Liu, X. Zuo, G. H. Wen, L. Li, R. K. Zheng, and S. P. Ringer

Phys. Rev. B 80, 174427 (2009) - Published 30 November, 2009

Superfluidity and superconductivity

Dynamic many-body theory: Pair fluctuations in bulk ${}^{4}H e$

C. E. Campbell and E. Krotscheck

Phys. Rev. B 80, 174501 (2009) - Published 2 November, 2009

Power-dependent internal loss in Josephson bifurcation amplifiers

Michio Watanabe, Kunihiro Inomata, Tsuyoshi Yamamoto, and Jaw-Shen Tsai

Phys. Rev. B 80, 174502 (2009) - Published 3 November, 2009

Off-diagonal long-range order and supersolidity in a quantum solid with vacancies

Yu Shi, Yin Yang, and Shao-Ming Fei

Phys. Rev. B 80, 174503 (2009) - Published 3 November, 2009

Negative impurity ions in liquid ${}^{4}H e$

F. Ancilotto, M. Barranco, and M. Pi

Phys. Rev. B 80, 174504 (2009) - Published 4 November, 2009

Origin of the checkerboard pattern in scanning tunneling microscopy maps of underdoped cuprate superconductors

Kai-Yu Yang, Wei-Qiang Chen, T. M. Rice, and Fu-Chun Zhang

Phys. Rev. B 80, 174505 (2009) - Published 6 November, 2009

Evidence for exchange interaction between donor and acceptor layers in $β^{'}$ -(BEDT-TTF)(TCNQ)

Yoshihiro Eto, Atsushi Kawamoto, Noriaki Matsunaga, Kazushige Nomura, Kaoru Yamamoto, and Kyuya Yakushi

Phys. Rev. B 80, 174506 (2009) - Published 6 November, 2009

Anisotropic microwave conductivity of cuprate superconductors in the presence of CuO chain-induced impurities

Zhi Wang and Shiping Feng

Phys. Rev. B 80, 174507 (2009) - Published 6 November, 2009

Nonlocal transport through multiterminal diffusive superconducting nanostructures

F. S. Bergeret and A. Levy Yeyati

Phys. Rev. B 80, 174508 (2009) - Published 9 November, 2009

Charge-carrier localization induced by excess Fe in the superconductor ${Fe}_{1 + y} {Te}_{1 - x} {Se}_{x}$

T. J. Liu, X. Ke, B. Qian, J. Hu, D. Fobes, E. K. Vehstedt, H. Pham, J. H. Yang, M. H. Fang, L. Spinu, P. Schiffer, Y. Liu, and Z. Q. Mao

Phys. Rev. B 80, 174509 (2009) - Published 9 November, 2009

EDITORS' SUGGESTION

Unconventional electronic reconstruction in undoped $(Ba, Sr) {Fe}_{2} {As}_{2}$ across the spin density wave transition

M. Yi, D. H. Lu, J. G. Analytis, J.-H. Chu, S.-K. Mo, R.-H. He, M. Hashimoto, R. G. Moore, I. I. Mazin, D. J. Singh, Z. Hussain, I. R. Fisher, and Z.-X. Shen

Phys. Rev. B 80, 174510 (2009) - Published 9 November, 2009