Lattice dynamics and thermal transport in multiferroic CuCrO2

Bansal, Dipanshu; Niedziela, Jennifer L.; May, Andrew F.; Said, Ayman; Ehlers, Georg; Abernathy, Douglas L.; Huq, Ashfia; Kirkham, Melanie; Zhou, Haidong; Delaire, Olivier

doi:10.1103/PhysRevB.95.054306

Title: Lattice dynamics and thermal transport in multiferroic ${CuCrO}_{2}$

Journal Article · 08 February 2017 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.95.054306 · OSTI ID:1361328

Bansal, Dipanshu ^[1]; Niedziela, Jennifer L. ^[1]; May, Andrew F. ^[1]; Said, Ayman ^[2]; Ehlers, Georg ^[1]; Abernathy, Douglas L. ^[1]; Huq, Ashfia ^[1]; Kirkham, Melanie ^[1]; Zhou, Haidong ^[3]; Delaire, Olivier ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Tennessee, Knoxville, TN (United States)

Inelastic neutron and x-ray scattering measurements of phonons and spin waves in CuCrO₂ were performed over a wide range of temperature, and complemented with first-principles simulations. The phonon dispersions and density of states are well reproduced by our density functional cal- culations, and reveal a strong anisotropy of Cu vibrations, with large amplitudes of low-frequency in-plane motions. In addition, we find that spin fluctuations persist above 300 K, far above the N eel temperature for long-range antiferromagnetic order, TN. Modeling of the thermal conductivity, based on our phonon measurements and simulations, reveals a significant anisotropy and indicates that the spin fluctuations above TN constitute a strong source of phonon scattering.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source; Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725; SC0001299; SC0001299

OSTI ID:: 1361328

Alternate ID(s):: OSTI ID: 1343331; OSTI ID: 1394380

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 5 Vol. 95; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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