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Title: In-plane multi-q magnetic ground state of Na3Co2SbO6

Journal Article · · Physical Review. B
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [3];  [3];  [3]; ORCiD logo [4]; ORCiD logo [5];  [6]; ORCiD logo [7]; ORCiD logo [7]; ORCiD logo [1]
  1. Peking University, Beijing (China)
  2. Peking University, Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China)
  3. Comprehensive Research Organization for Science and Society, Tokai (Japan)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  5. Chinese Academy of Sciences (CAS), Beijing (China); Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Department; University of Chinese Academy of Sciences, Beijing (China)
  6. Australian Nuclear Science and Technology Organisation, Lucas Heights (Australia)
  7. Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Department

We report Na3Co2SbO6 is a potential Kitaev magnet with a monoclinic layered crystal structure. Recent investigations of the C3-symmetric sister compound Na2Co2TeO6 have uncovered a unique triple-q magnetic ground state, as opposed to a single-q (zigzag) one, prompting us to examine the influence of the reduced structural symmetry of Na3Co2SbO6 on its ground state. Neutron diffraction data obtained on a twin-free crystal reveal that the ground state remains a multi-q state, despite the system's strong non-C3-symmetric anisotropy. This robustness of multi-q orders suggests that they are driven by a common mechanism in the honeycomb cobaltates, such as interactions beyond the bilinear order. Spin-polarized neutron diffraction results show that the ordered moments are entirely in plane, with each staggered component orthogonal to the propagating wave vector. The inferred ground state appears more compatible with the so-called XXZ easy-plane anisotropy than the Kitaev anisotropy, and features unequal ordered moments reduced by strong quantum fluctuations.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Basic Research Program of China; National Science Foundation of China
Grant/Contract Number:
AC05-00OR22725; SC0012704
OSTI ID:
2333755
Alternate ID(s):
OSTI ID: 2341826; OSTI ID: 2474018
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 109; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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