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Antiferromagnetic magnons and local anisotropy: Dynamical mean-field study

A. Niyazi1, D. Geffroy2,1, and J. Kuneš1

  • 1Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
  • 2Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czechia

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Phys. Rev. B 104, 075152 – Published 26 August, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.075152

Abstract

We present a dynamical mean-field study of antiferromagnetic magnons in a one-, two-, and three-orbital Hubbard model of square and bcc cubic lattice at intermediate coupling strength. We investigate the effect of anisotropy introduced by an external magnetic field or single-ion anisotropy. For the latter we tune continuously between the easy-axis and easy-plane models. We also analyze a model with spin-orbit coupling in cubic site-symmetry setting. The ordered states as well as the magnetic excitations are sensitive to even a small breaking of SU(2) symmetry of the model and follow the expectations of spin-wave theory as well as general symmetry considerations.

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Phys. Rev. B 104, 075152– Published 26 August, 2021
  • Received 26 May 2021
  • Revised 8 August 2021
  • Accepted 11 August 2021
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