Abstract
Physics In quantum spin liquid (QSL), an exotic state of matter predicted to occur in certain materials, spins remain in a liquid-like state down to the lowest temperatures. A theoretical realization of a QSL is the Kitaev model, where spins reside on a two-dimensional hexagonal lattice. The layered material RuCl3 is thought to display the Kitaev model physics. Modic et al. studied magnetic anisotropy in RuCl3. They focused on the magnetotropic coefficient, which reflects the rigidity of a material to rotation in a magnetic field. In a certain temperature range, the coefficient scaled linearly with the magnetic field, indicating that the relevant energy scales were those set by temperature and magnetic field rather than by magnetic interactions intrinsic to the material. Nat. Phys. 10.1038/s41567-020-1028-0 (2020).
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