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Coexistence of static and dynamic magnetism in the Kitaev spin liquid material Cu2IrO3

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [1];  [5];  [5];  [6];  [1];  [4];  [7];  [7];  [7];  [3];  [1];  [1]
  1. Boston College, Chestnut Hill, MA (United States)
  2. Illinois Inst. of Technology, Chicago, IL (United States)
  3. Univ. Rennes, Rennes (France)
  4. Lab. CRISMAT, Caen (France)
  5. Rutherford Appleton Lab., Didcot (United Kingdom)
  6. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  7. Argonne National Lab. (ANL), Argonne, IL (United States)
Searching for a Kitaev spin liquid phase motivated intense research on the honeycomb iridate materials. However, access to a spin liquid ground state has been hindered by magnetic ordering. Cu2IrO3 is a new honeycomb iridate without thermodynamic signatures of a long-range order. Here, we use muon spin relaxation to uncover the magnetic ground state of Cu2IrO3. We find a two-component depolarization with slow- and fast-relaxation rates corresponding to distinct regions with dynamic and static magnetism coexisting in the material. X-ray absorption spectroscopy and first-principles calculations identify a mixed copper valence as the origin of this behavior. Furthermore, our results suggest that a minority of Cu2+ ions nucleate regions of static magnetism, whereas the majority of Cu+/Ir4+ on the honeycomb lattice give rise to a Kitaev spin liquid.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Agence Nationale de la recherche (ANR); National Science Foundation (NSF); USDOE; USDOE Office of Science (SC); United Kingdom Science and Technology Facilities Council
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1579924
Alternate ID(s):
OSTI ID: 1561397
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 9 Vol. 100; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Magnetism of Ir 5 + -based double perovskites: Unraveling its nature and the influence of structure journal January 2020
Thermodynamic Evidence of Proximity to a Kitaev Spin Liquid in Ag 3 LiIr 2 O 6 journal December 2019

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