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Title: Pressure-tuning of bond-directional exchange interactions and magnetic frustration in hyperhoneycomb iridate β-Li 2IrO 3

Here, we explore the response of Ir 5d orbitals to pressure in β-Li 2IrO 3, a hyperhoneycomb iridate in proximity to a Kitaev quantum spin-liquid (QSL) ground state. X-ray absorption spectroscopy reveals a reconstruction of the electronic ground state below 2 GPa, the same pressure range where x-ray magnetic circular dichroism shows an apparent collapse of magnetic order. The electronic reconstruction, which manifests a reduction in the effective spin-orbit interaction in 5d orbitals, pushes β-Li 2IrO 3 further away from the pure J eff = 1/2 limit. Although lattice symmetry is preserved across the electronic transition, x-ray diffraction shows a highly anisotropic compression of the hyperhoneycomb lattice which affects the balance of bond-directional Ir-Ir exchange interactions driven by spin-orbit coupling at Ir sites. An enhancement of symmetric anisotropic exchange over Kitaev and Heisenberg exchange interactions seen in theoretical calculations that use precisely this anisotropic Ir-Ir bond compression provides one possible route to the realization of a QSL state in this hyperhoneycomb iridate at high pressures.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [2] ;  [6] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [6] ;  [11] ;  [11] ;  [12]
  1. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Argonne National Lab. (ANL), Argonne, IL (United States); Univ. College London, London (United Kingdom)
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Center for High Pressure Science & Technology Advanced Research (HPSTAR), Shanghai (China); Chinese Academy of Sciences (CAS), Beijing (China)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Brazilian Synchrotron Light Lab. (LNLS), Campinas (Brazil)
  5. Argonne National Lab. (ANL), Argonne, IL (United States); Washington Univ., St. Louis, MO (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Washington Univ., St. Louis, MO (United States)
  7. Univ. of Toronto, Toronto, ON (Canada)
  8. Univ. of Toronto, Toronto, ON (Canada); Canadian Institute for Advanced Research/Quantum Materials Program, Toronto, ON (Canada)
  9. Center for High Pressure Science & Technology Advanced Research (HPSTAR), Shanghai (China); Carnegie Inst. of Washington, Argonne, IL (United States)
  10. Argonne National Lab. (ANL), Argonne, IL (United States); Northern Illinois Univ., DeKalb, IL (United States)
  11. Max Planck Institute for Solid State Research, Stuttgart (Germany); Univ. of Tokyo, Tokyo (Japan)
  12. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Report Number(s):
BNL-114421-2017-JA
Journal ID: ISSN 0163-1829; 135629; TRN: US1702869
Grant/Contract Number:
AC02-06CH11357; SC0012704; 1047478; FG02-03ER46097; NA0001974; FG02-99ER45775
Type:
Accepted Manuscript
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 96; Journal Issue: 14; Journal ID: ISSN 0163-1829
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:
Argonne National Laboratory, Advanced Photon Source; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Materials Sciences and Engineering Division; USDOE National Nuclear Security Administration (NNSA); 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
OSTI Identifier:
1402077
Alternate Identifier(s):
OSTI ID: 1398826; OSTI ID: 1412661