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Title: Magnetic interactions in NiO at ultrahigh pressure

Here, magnetic properties of NiO have been studied in the multimegabar pressure range by nuclear forward scattering of synchrotron radiation using the 67.4 keV M ssbauer transition of 61Ni. The observed magnetic hyperfine splitting confirms the antiferromagnetic state of NiO up to 280 GPa, the highest pressure where magnetism has been observed so far, in any material. Remarkably, the hyperfine field increases from 8.47 T at ambient pressure to ~24 T at the highest pressure, ruling out the possibility of a magnetic collapse. A joint x-ray diffraction and extended x-ray-absorption fine structure investigation reveals that NiO remains in a distorted sodium chloride structure in the entire studied pressure range. Ab initio calculations support the experimental observations, and further indicate a complete absence of Mott transition in NiO up to at least 280 GPa.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [2] ;  [6] ;  [7] ;  [5] ;  [2] ;  [4] ;  [4] ;  [8] ;  [8] ;  [9]
  1. Julich Centre for Neutron Science (JCNS) and Peter Grunberg Institut (PGI), JARA-FIT, Forschungszentrum Julich GmbH, Julich (Germany)
  2. Univ. Bayreuth, Bayreuth (Germany)
  3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  4. Linkoping Univ., Linkoping (Sweden)
  5. European Synchrotron Radiation Facility, Grenoble (France)
  6. Univ. of Chicago, Chicago, IL (United States)
  7. Julich Centre for Neutron Science (JCNS) and Peter Grunberg Institut (PGI), JARA-FIT, Forschungszentrum Julich GmbH, Julich (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. Ludwig-Maximilian Univ. Munich, Munich (Germany)
  9. Linkoping Univ., Linkoping (Sweden); National Univ. of Science and Technology 'MISIS', Moscow (Russia); Tomsk State Univ., Tomsk (Russia)
Publication Date:
OSTI Identifier:
1261557
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY