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Updated: Sep 17, 2025

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
Direct Evidence for Anisotropic Magnetic Interaction in α-RuCl_{3} from Polarized Inelastic Neutron Scattering
Markus Braden1, Xiao Wang2,3,4, Alexandre Bertin1
1Universität zu Köln, II. Physikalisches Institut, Zülpicher Str. 77, D-50937 Köln, Germany.
Abstract:
Polarized neutron scattering experiments reveal anisotropy of magnetic correlations in the candidate Kitaev material α-RuCl_{3}. The anisotropy of the inelastic response at the magnetic Bragg positions is opposite to the expectation for a simple Heisenberg model. Near the antiferromagnetic propagation vector, there are no low-energy transversal magnon modes and the response is always uniaxially polarized. These observations directly prove the fully anisotropic and bond-directional character of the magnetic interaction in α-RuCl_{3}. However, other findings disagree with a simple or strongly dominant Kitaev component.
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