Magnetic excitations in a spin-orbit-coupled d4 Mott insulator on the square lattice

Alireza Akbari and Giniyat Khaliullin
Phys. Rev. B 90, 035137 – Published 28 July 2014

Abstract

We study the magnetic order and excitations in strong spin-orbit-coupled, Van Vleck–type, d4 Mott insulators on a square lattice. Extending the previous work, we include the tetragonal crystal-field splitting and explore its effects on the magnetic phase diagram and magnon spectra. Two different ordered phases, with in-plane and out-of-plane orientations of the staggered moments, are found for the higher and lower values of the crystal-field splitting, respectively. The magnetic excitation spectra for paramagnetic and magnetically ordered phases are calculated and discussed in the context of a candidate spin-orbit d4 Mott insulator, Ca2RuO4.

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  • Received 16 May 2014
  • Revised 15 July 2014

DOI:https://doi.org/10.1103/PhysRevB.90.035137

©2014 American Physical Society

Authors & Affiliations

Alireza Akbari and Giniyat Khaliullin

  • Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

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Issue

Vol. 90, Iss. 3 — 15 July 2014

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