Static and dynamical magnetic properties of the extended Kitaev-Heisenberg model with spin vacancies

Abstract

Motivated by the potential to suppress the antiferromagnetic long-range order in favor of the long-sought-after Kitaev quantum spin liquid state, we study the effect of spin vacancies in the extended Kitaev-Heisenberg model. In particular, we focus on a realistic model obtained from fitting inelastic neutron scattering on $\alpha$-RuCl${}_3$. We observe that the long-range zigzag magnetic ordered state only survives when the doping concentration is smaller than 5\%. Upon further increasing the spin vacancy concentration, the ground state becomes a short-range ordered state at low temperatures. Compared with experiments, our classical solution over-stabilizes the zigzag correlation in the presence of spin vacancies. Our theoretical results provide guidance toward interpreting inelastic neutron scattering experiments on magnetically diluted Kitaev candidate materials.

arXiv comment9 figures

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Cited by in corpus (3)

• A primer on Kitaev Model: Basic aspects, material realization, and recent experiments
• Topological Majorana flat bands in the Kitaev model on a Bishamon-kikko lattice
• Bond disorder in extended Heisenberg-Kitaev models: Spin textures and in-gap states in the high-field regime