%0 Journal Article
%T Highly anisotropic magnon dispersion in Ca2RuO4: evidence for strong spin orbit coupling
%A S. Kunkem£żller
%A D. Khomskii
%A P. Steffens
%A A. Piovano
%A A. Nugroho
%A M. Braden
%J Physics
%D 2015
%I arXiv
%R 10.1103/PhysRevLett.115.247201
%X 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.
%U http://arxiv.org/abs/1509.03999v2