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Title: Magnetic interactions in PdCrO 2 and their effects on its magnetic structure

Abstract

We report a neutron scattering study of the metallic triangular lattice antiferromagnet PdCrO 2. 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.

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [4];  [5];  [6];  [6];  [7];  [7];  [4];  [2]
  1. 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
  2. Seoul National Univ. (Korea, Republic of). IBS Research Center for Correlated Electron Systems; Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  4. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
  5. 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
  6. Chonnam National Univ., Gwangju (Korea). Dept. of Physics
  7. Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Research Foundation of Korea (NRF)
OSTI Identifier:
1463969
Alternate Identifier(s):
OSTI ID: 1462292
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

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., and Park, Je-Geun. Magnetic interactions in PdCrO2 and their effects on its magnetic structure. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.024429.
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. Magnetic interactions in PdCrO2 and their effects on its magnetic structure. United States. doi:10.1103/PhysRevB.98.024429.
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., and Park, Je-Geun. Tue . "Magnetic interactions in PdCrO2 and their effects on its magnetic structure". United States. doi:10.1103/PhysRevB.98.024429. https://www.osti.gov/servlets/purl/1463969.
@article{osti_1463969,
title = {Magnetic interactions in PdCrO2 and their effects on its magnetic structure},
author = {Le, Manh Duc and Jeon, Seyyoung and Kolesnikov, Alexander I. and Voneshen, D. J. and Gibbs, A. S. and Kim, Jun Sung and Jeong, Jinwon and Noh, Han-Jin and Park, Changhwi and Yu, Jaejun and Perring, T. G. and Park, Je-Geun},
abstractNote = {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 TN. 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.},
doi = {10.1103/PhysRevB.98.024429},
journal = {Physical Review B},
number = 2,
volume = 98,
place = {United States},
year = {2018},
month = {7}
}

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