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Title: Resonant x-ray scattering reveals possible disappearance of magnetic order under hydrostatic pressure in the Kitaev candidate γ - Li 2 IrO 3

Honeycomb iridates such as γ-Li 2IrO 3 are argued to realize Kitaev spin-anisotropic magnetic exchange, along with Heisenberg and possibly other couplings. While systems with pure Kitaev interactions are candidates to realize a quantum spin-liquid ground state, in γ-Li 2IrO 3 it has been shown that the presence of competing magnetic interactions leads to an incommensurate spiral spin order at ambient pressure below 38 K. In this paper, we study the pressure sensitivity of this magnetically ordered state in single crystals of γ-Li 2IrO 3 using resonant x-ray scattering (RXS) under applied hydrostatic pressures of up to 3 GPa. Finally, RXS is a direct probe of electronic order, and we observe the abrupt disappearance of the q sp = (0.57, 0, 0) spiral order at a critical pressure P c = 1.4 GPa with no accompanying change in the symmetry of the lattice.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division
  2. Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source; Univ. of Illinois, Urbana, IL (United States). Dept. of Geology
  4. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
Publication Date:
Grant/Contract Number:
SC0014039; AC02-06CH11357; GBMF4374; EAR-1606856
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Univ. of California, Berkeley, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Gordon and Betty Moore Foundation (United States); National Science Foundation (NSF)
Contributing Orgs:
Univ. of Illinois, Urbana, IL (United States)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; frustrated magnetism; magnetic phase transitions; magnetic insulators; x-ray resonant magnetic scattering; condensed matter and materials physics
OSTI Identifier:
1372316
Alternate Identifier(s):
OSTI ID: 1368419