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• W3105862904 abstract "What is the correct low-energy spin Hamiltonian description of $alpha$-RuCl$_3$? The material is a promising Kitaev spin liquid candidate, but is also known to order magnetically, the description of which necessitates additional interaction terms. The nature of these interactions, their magnitudes and even signs, remain an open question. In this work we systematically investigate dynamical and thermodynamic magnetic properties of proposed effective Hamiltonians. We calculate zero-temperature inelastic neutron scattering (INS) intensities using exact diagonalization, and magnetic specific heat using a thermal pure quantum states method. We find that no single current model satisfactorily explains all observed phenomena of $alpha$-RuCl$_3$. In particular, we find that Hamiltonians derived from first principles can capture the experimentally observed high-temperature peak in the magnetic specific heat, while overestimating the magnon energy at the zone center. In contrast, other models reproduce important features of the INS data, but do not adequately describe the magnetic specific heat. To address this discrepancy we propose a modified ab initio model that is consistent with both magnetic specific heat and low-energy features of INS data." @default.
• W3105862904 created "2020-11-23" @default.
• W3105862904 creator A5013873940 @default.
• W3105862904 creator A5064157442 @default.
• W3105862904 date "2020-01-10" @default.
• W3105862904 modified "2023-10-18" @default.
• W3105862904 title "Dynamical and thermal magnetic properties of the Kitaev spin liquid candidate α-RuCl3" @default.
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• W3105862904 doi "https://doi.org/10.1038/s41535-019-0203-y" @default.
• W3105862904 hasPublicationYear "2020" @default.
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