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Title: Strongly gapped spin-wave excitation in the insulating phase of NaOsO 3

NaOsO 3 hosts a rare manifestation of a metal-insulator transition driven by magnetic correlations, placing the magnetic exchange interactions in a central role. We use resonant inelastic x-ray scattering to directly probe these magnetic exchange interactions. A dispersive and strongly gapped (58 meV) excitation is observed indicating appreciable spin-orbit coupling in this 5d 3 system. The excitation is well described within a minimal model Hamiltonian with strong anisotropy and Heisenberg exchange (J 1 = J 2 = 13.9 meV). As a result, the observed behavior places NaOsO 3 on the boundary between localized and itinerant magnetism.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [3] ;  [4] ;  [13]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. College London, London (United Kingdom); Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne (Switzlerland)
  3. IFW Dresden, Dresden (Germany)
  4. Univ. College London, London (United Kingdom)
  5. Univ. College London, London (United Kingdom); Diamond Light Source Ltd., Oxfordshire (United Kingdom)
  6. European Synchrotron Radiation Facility, Grenoble Cedex (France)
  7. Brookhaven National Lab. (BNL), Upton, NY (United States); Chinese Academy of Sciences (CAS), Beijing (China)
  8. Argonne National Lab. (ANL), Argonne, IL (United States)
  9. Chinese Academy of Sciences (CAS), Beijing (China); National Institute for Materials Science, Ibaraki (Japan)
  10. National Institute for Materials Science, Ibaraki (Japan)
  11. National Institute for Materials Science, Ibaraki (Japan); Hokkaido Univ., Hokkaido (Japan)
  12. Brookhaven National Lab. (BNL), Upton, NY (United States)
  13. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Report Number(s):
BNL-203590-2018-JAAM
Journal ID: ISSN 2469-9950; PRBMDO; 132622; TRN: US1702653
Grant/Contract Number:
AC02-06CH11357; SC00112704; SC0012704
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
Chinese Academy of Sciences (CAS); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
OSTI Identifier:
1369058
Alternate Identifier(s):
OSTI ID: 1341272; OSTI ID: 1435736