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arXiv · 1509.03999

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

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.

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S. Kunkemöller, D. Khomskii, P. Steffens, A. Piovano, A. Nugroho, M. Braden. 2015-09-15. Highly anisotropic magnon dispersion in Ca2RuO4: evidence for strong spin orbit coupling. https://doi.org/10.1103/physrevlett.115.247201

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