Magnetic Excitations in Spin-Orbit Coupled $d^4$ Mott Insulator on Square Lattice

Alireza Akbari; Giniyat Khaliullin

doi:10.1103/PhysRevB.90.035137

Magnetic Excitations in Spin-Orbit Coupled $d^4$ Mott Insulator on Square Lattice

Strongly Correlated Electrons 2014-07-29 v2

Authors: Alireza Akbari , Giniyat Khaliullin

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Abstract

We study the magnetic order and excitations in strong spin-orbit coupled, Van Vleck-type, $d^4$ Mott insulators on a square lattice. Extending the previous work, we include the tetragonal crystal field splitting and explore its effects on magnetic phase diagram and magnon spectra. Two different ordered phases, with in-plane and out-of-plane orientation 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 $d^4$ Mott insulator Ca $_2$ RuO $_4$ .

Keywords

spin-orbit coupling Mott insulator magnetic excitations crystal field splitting magnon spectra Ca$_2$RuO$_4$

Cite

@article{arxiv.1405.6062,
  title  = {Magnetic Excitations in Spin-Orbit Coupled $d^4$ Mott Insulator on Square Lattice},
  author = {Alireza Akbari and Giniyat Khaliullin},
  journal= {arXiv preprint arXiv:1405.6062},
  year   = {2014}
}

Comments

7 pages, 6 figures; to appear in PRB

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