Theoretical investigation of magnetic dynamics in αRuCl3

Wei Wang, Zhao-Yang Dong, Shun-Li Yu, and Jian-Xin Li
Phys. Rev. B 96, 115103 – Published 5 September 2017
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Abstract

We study spin-wave excitations in αRuCl3 by the spin-wave theory. Starting from the five-orbital Hubbard model and the perturbation theory, we derive an effective isospin-1/2 model in the large Hubbard (U) limit. Based on the energy-band structure calculated from the first-principles method, we find that the effective model can be further reduced to the KΓ model containing a ferromagnetic nearest-neighbor (NN) Kitaev interaction (K) and a NN off-diagonal exchange interaction (Γ). With the spin-wave theory, we find that the KΓ model can give magnetic excitations, which is consistent with recent neutron-scattering experiments.

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  • Received 6 February 2017
  • Revised 11 May 2017

DOI:https://doi.org/10.1103/PhysRevB.96.115103

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Wei Wang, Zhao-Yang Dong, Shun-Li Yu, and Jian-Xin Li*

  • National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, China

  • *jxli@nju.edu.cn

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Issue

Vol. 96, Iss. 11 — 15 September 2017

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