Anisotropic susceptibilities in the honeycomb Kitaev system α−RuCl3

作     者：P. Lampen-Kelley S. Rachel J. Reuther J.-Q. Yan A. Banerjee C. A. Bridges H. B. Cao S. E. Nagler D. Mandrus 

作者机构：Department of Materials Science and Engineering University of Tennessee Knoxville Tennessee 37996 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA School of Physics University of Melbourne Parkville VIC 3010 Australia Institut für Theoretische Physik Technische Universität Dresden D-01062 Dresden Germany Dahlem Center for Complex Quantum Systems and Fachbereich Physik Freie Universität Berlin D-14195 Berlin Germany Helmholtz-Zentrum Berlin für Materialien und Energie D-14109 Berlin Germany Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Chemical Sciences Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2018年第98卷第10期

页      面：100403(R)-100403(R)页

核心收录：

基　　金：Office of Science - BES Office of Science - Basic Energy Sciences U.S. Department of Energy, USDOE Gordon and Betty Moore Foundation, GBMF, (GBMF4416) Gordon and Betty Moore Foundation, GBMF Basic Energy Sciences, BES Automotive Research Center, ARC, (FT180100211) Automotive Research Center, ARC Division of Materials Sciences and Engineering, DMSE Deutsche Forschungsgemeinschaft, DFG, (SFB 1143) Deutsche Forschungsgemeinschaft, DFG Freie Universität Berlin, FU Berlin 

主　　题：Magnetic anisotropy Quantum spin liquid DC susceptibility measurements Kitaev-Heisenberg model 

摘      要：The magnetic insulator α−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 α−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-Γ 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 Γ spin exchange. The Γ couplings and relationships between other terms in the model Hamiltonian are quantified by extracting relevant Curie-Weiss intercepts from the experimental data.