Magnetotropic Response in Ruthenium Chloride |
| I. Mandal
Institute of Nuclear Physics, Polish Academy of Sciences, W.E. Radzikowskiego 152, 31-342 Kraków, Poland |
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| We consider exchange couplings present in an effective Hamiltonian for α-RuCl3, known as the K-Γ model. The material considered has a honeycomb lattice and is intended to be representative of the Kitaev materials (which can realize the 2D Kitaev model). However, the behaviour of RuCl3 shows that the exchange interactions of this material are not purely Kitaev-like, especially since it has antiferromagnetic order at low temperatures and at low intensities of an applied external magnetic field. Fitting the data obtained from the measurements of the magnetotropic coefficient (thermodynamic coefficient associated with magnetic anisotropy), reported in Nat. Phys. 17, 240 (2021), we estimate the values of the exchange couplings of the effective Hamiltonian. The fits indicate that the Kitaev couplings are subdominant to other exchange couplings. |
DOI:10.12693/APhysPolA.140.372 topics: α-RuCl3, magnetotropic coefficient, K-Γ model |