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Direct evidence for anisotropic magnetic interaction in $\alpha$-RuCl$_3$ from polarized inelastic neutron scattering

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arxiv 2409.08854 v1 pith:4ILPBHJ5 submitted 2024-09-13 cond-mat.str-el

Markus Braden , Xiao Wang , Alexandre Bertin , Paul Steffens , Yixi Su This is my paper · ORCID
classification cond-mat.str-el
keywords magneticalpharuclanisotropicanisotropyinelasticinteractionkitaev
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abstract

Polarized neutron scattering experiments reveal the anisotropy of magnetic correlations in the candidate Kitaev material $\alpha$-RuCl$_3$. The anisotropy of the inelastic response at the magnetic Bragg positions is just opposite to the expectation for a simple Heisenberg model. Near the antiferromagnetic $q$ vector, there are no low-energy transversal magnon modes directly documenting the fully anisotropic and bond-directional character of the magnetic interaction in $\alpha$-RuCl$_3$. However, other findings disagree with a simple or strongly dominant Kitaev component.

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  1. Magnetic excitations in biaxial-strain detwinned $\alpha$-RuCl$_{3}$

    cond-mat.str-el 2025-09 conditional novelty 6.0 of 10

    In detwinned alpha-RuCl3, low-energy magnons arise at M points transverse to the zigzag Bragg peaks, and a sixfold-symmetric continuum up to 16 meV is attributed to fractionalized Kitaev excitations.

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