Date of this Version
Physical Review Letters
The origins of anisotropy in the effective spin Hamiltonian, describing the ground manifold of Hubbard models with spin-orbit interactions, are critically discussed. For tetragonal symmetry, we show exactly that spin anisotropy can arise only if one includes both spin-orbit and Coulomb exchange interactions. For lower symmetries, additional anisotropies arise from terms which were hitherto neglected. Our analytic results are supported by numerical solutions for single bond clusters. These results can explain the easy plane anisotropy in the antiferromagnetic cuprates.
Yildirim, T., Harris, A., Entin-Wohlman, O., & Aharony, A. (1994). Symmetry, Spin-Orbit Interactions, and Spin Anisotropies. Physical Review Letters, 73 (21), 2919-2922. http://dx.doi.org/10.1103/PhysRevLett.73.2919
Date Posted: 20 August 2015
This document has been peer reviewed.