Dzyaloshinsky-Moriya antisymmetric exchange coupling in cuprates: Oxygen effects
Abstract
We revisit a problem of Dzyaloshinsky-Moriya antisymmetric exchange coupling for a single bond in cuprates specifying the local spin-orbital contributions to Dzyaloshinsky vector focusing on the oxygen term. The Dzyaloshinsky vector and respective weak ferromagnetic moment is shown to be a superposition of comparable and, sometimes, competing local Cu and O contributions. The intermediate oxygen O Knight shift is shown to be an effective tool to inspect the effects of Dzyaloshinsky-Moriya coupling in an external magnetic field. We predict the effect of oxygen weak antiferromagnetism in edge-shared CuO chains due to uncompensated oxygen Dzyaloshinsky vectors. Finally, we revisit the effects of symmetric spin anisotropy, in particular, those directly induced by Dzyaloshinsky-Moriya coupling.
Cite
@article{arxiv.cond-mat/0610537,
title = {Dzyaloshinsky-Moriya antisymmetric exchange coupling in cuprates: Oxygen effects},
author = {A. S. Moskvin},
journal= {arXiv preprint arXiv:cond-mat/0610537},
year = {2009}
}
Comments
12 pages, 2 figures, submitted to JETP