Highly anisotropic magnon dispersion in Ca2RuO4: evidence for strong spin orbit coupling

S. Kunkemöller; D. Khomskii; P. Steffens; A. Piovano; A. Nugroho; M. Braden

doi:10.1103/PhysRevLett.115.247201

Highly anisotropic magnon dispersion in Ca2RuO4: evidence for strong spin orbit coupling

Strongly Correlated Electrons 2015-12-16 v2

Authors: S. Kunkemöller , D. Khomskii , P. Steffens , A. Piovano , A. Nugroho , M. Braden

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Abstract

The magnon disp ersion in Ca2RuO4 has been determined by inelastic neutron scattering on single crytals containing 1% of Ti. The dispersion is well described by a conventional Heisenberg model suggesting a local moment model with nearest neighbor interaction of J=8 meV. Nearest and next-nearest neighbor interaction as well as inter-layer coupling parameters are required to properly describe the entire dispersion. Spin-orbit coupling induces a very large anisotropy gap in the magnetic excitations in apparent contrast with a simple planar magnetic model. Orbital ordering breaking tetragonal symmetry, and strong spin-orbit coupling can thus be identified as important factors in this system.

Keywords

magnon dispersion Ca2RuO4 spin orbit coupling Heisenberg model inelastic neutron scattering anisotropy gap orbital ordering

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@article{arxiv.1509.03999,
  title  = {Highly anisotropic magnon dispersion in Ca2RuO4: evidence for strong spin orbit coupling},
  author = {S. Kunkemöller and D. Khomskii and P. Steffens and A. Piovano and A. Nugroho and M. Braden},
  journal= {arXiv preprint arXiv:1509.03999},
  year   = {2015}
}

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5 pages, 4 figures

Highly anisotropic magnon dispersion in Ca2RuO4: evidence for strong spin orbit coupling

Abstract

Keywords

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