Magnetic interactions in PdCrO2 and their effects on its magnetic structure

Le, Manh Duc; Jeon, Seyyoung; Kolesnikov, Alexander I.; Voneshen, D. J.; Gibbs, A. S.; Kim, Jun Sung; Jeong, Jinwon; Noh, Han-Jin; Park, Changhwi; Yu, Jaejun; Perring, T. G.; Park, Je-Geun

doi:10.1103/PhysRevB.98.024429

Title: Magnetic interactions in ${PdCrO}_{2}$ and their effects on its magnetic structure

Journal Article · 31 July 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.98.024429 · OSTI ID:1463969

Le, Manh Duc ^[1]; Jeon, Seyyoung ^[2];

^[3]; Voneshen, D. J. ^[4]; Gibbs, A. S. ^[4]; Kim, Jun Sung ^[5]; Jeong, Jinwon ^[6]; Noh, Han-Jin ^[6]; Park, Changhwi ^[7]; Yu, Jaejun ^[7]; Perring, T. G. ^[4]; Park, Je-Geun ^[2]

Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source; Seoul National Univ. (Korea, Republic of). IBS Research Center for Correlated Electron Systems
Seoul National Univ. (Korea, Republic of). IBS Research Center for Correlated Electron Systems; Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
Pohang Univ. of Science and Technology, Pohang (Korea). Dept. of Physics; Inst. for Basic Science (IBS), Pohang (Korea). Center for Artificial Low Dimensional Electronic Systems
Chonnam National Univ., Gwangju (Korea). Dept. of Physics
Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy

We report a neutron scattering study of the metallic triangular lattice antiferromagnet PdCrO₂. Powder neutron diffraction measurements confirm that the crystalline space group symmetry remains R$$\bar{3}$$m below T_N. This implies that magnetic interactions consistent with the crystal symmetry do not stabilize the noncoplanar magnetic structure, which was one of two structures previously proposed on the basis of single crystal neutron diffraction measurements. Inelastic neutron scattering measurements find two gaps at low energies, which can be explained as arising from a dipolar-type exchange interaction. This symmetric anisotropic interaction also stabilizes a magnetic structure very similar to the coplanar magnetic structure, which was also suggested by the single crystal diffraction study. In conclusion, the higher-energy magnon dispersion can be modelled by linear spin-wave theory with exchange interactions up to sixth nearest neighbors, but discrepancies remain which hint at additional effects unexplained by the linear theory.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Research Foundation of Korea (NRF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1463969

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Hidden Mott insulator in metallic PdCrO 2 Lechermann, Frank Physical Review Materials, Vol. 2, Issue 8 https://doi.org/10.1103/physrevmaterials.2.085004	journal	August 2018
Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system Sunko, V.; Mazzola, F.; Kitamura, S. Science Advances, Vol. 6, Issue 6 https://doi.org/10.1126/sciadv.aaz0611	journal	February 2020
Probing spin correlations using angle resolved photoemission in a coupled metallic/Mott insulator system Sunko, V.; Mazzola, F.; Kitamura, S. arXiv https://doi.org/10.48550/arxiv.1809.08972	text	January 2018

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