期刊
PHYSICAL REVIEW B
卷 98, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.100403
关键词
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资金
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4416]
- U.S. Department of Energy (U.S.-DOE), Office of Science - Basic Energy Sciences (BES), Materials Sciences and Engineering Division
- U.S.-DOE, Office of Science - BES, Scientific User Facilities Division
- DFG [SFB 1143]
- ARC [FT180100211]
- Freie Universitat Berlin within the Excellence Initiative of the German Research Foundation
The magnetic insulator alpha-RuCl3 is a promising candidate to realize Kitaev interactions on a quasi-two-dimensional honeycomb lattice. We perform extensive susceptibility measurements on single crystals of alpha-RuCl3, including angle dependence of the in-plane longitudinal and transverse susceptibilities, which reveal a unidirectional anisotropy within the honeycomb plane. By comparing the experimental results to a high-temperature expansion of a Kitaev-Heisenberg-Gamma spin Hamiltonian with bond anisotropy, we find excellent agreement with the observed phase shift and periodicity of the angle-resolved susceptibilities. Within this model, we show that the pronounced difference between in-plane and out-of-plane susceptibilities as well as the finite transverse susceptibility are rooted in strong symmetric off-diagonal Gamma spin exchange. The Gamma couplings and relationships between other terms in the model Hamiltonian are quantified by extracting relevant Curie-Weiss intercepts from the experimental data.
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