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Title: Continuum of magnetic excitations in the Kitaev honeycomb iridate D3LiIr2O6

Journal Article · · npj Quantum Materials
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4];  [4];  [5]; ORCiD logo [6];  [7]; ORCiD logo [8];  [9]; ORCiD logo [7]; ORCiD logo [10]; ORCiD logo [11]; ORCiD logo [12]
  1. Johns Hopkins Univ., Baltimore, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  2. Johns Hopkins Univ., Baltimore, MD (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Brown Univ., Providence, RI (United States)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  6. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  7. Johns Hopkins Univ., Baltimore, MD (United States)
  8. Technische Univ. Munchen, Garching (Germany); Munich Center for Quantum Science and Technology (MCQST), Munich (Germany); Imperial College, London (United Kingdom)
  9. Max Planck Society, Dresden (Germany). Max Planck Inst. for the Physics of Complex Systems
  10. Max Planck Institute of Solid State Research, Stuttgart (Germany)
  11. Max Planck Institute of Solid State Research, Stuttgart (Germany); Univ. of Tokyo (Japan)
  12. Johns Hopkins Univ., Baltimore, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
+ Show Author Affiliations

Inelastic neutron scattering (INS) measurements of powder D3(7Li)(193Ir)2O6 reveal low energy magnetic excitations with a scattering cross-section that is broad in ∣Q∣ and energy transfer. The magnetic nature of the excitation spectrum is demonstrated by longitudinally polarized neutron scattering. The total magnetic moment of 1.8(4)μB/Ir inferred from the observed magnetic scattering cross-section is consistent with the effective moment inferred from magnetic susceptibility data and expectations for the Jeff = 1/2 single ion state. The rise in the dynamic correlation function $$\mathcal{S}(Q,w)$$ for ℏω < 5 meV can be described by a simple model assuming nearest-neighbor anisotropic spin exchange, such as that found in the Kitaev model. Exchange disorder associated with the D site likely plays an important role in stabilizing the low T quantum fluctuating state.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); The Johns Hopkins University
Sponsoring Organization:
Deutsche Forschungsgemeinschaft; Gordon and Betty Moore Foundation; Gordon and Betty Moore Foundation (GBMF); National Science Foundation; National Science Foundation (NSF); U.S. Department of Energy; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; SC0019331; SC0024469
OSTI ID:
2543151
Journal Information:
npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 10; ISSN 2397-4648
Publisher:
Springer Science and Business Media LLCCopyright Statement
Country of Publication:
United States
Language:
English

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