Dzyaloshinsky-Moriya antisymmetric exchange coupling in cuprates: Oxygen effects

Details Dzyaloshinsky-Moriya antisymmetric exchange coupling in cuprates: Oxygen effects Dzyaloshinsky-Moriya antisymmetric exchange coupling in cuprates: Oxygen effects

2006-10-19

arxiv.org/abs/cond-mat/0610537v1

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 2 figures, submitted to JETP

Scientific paper

10.1134/S106377610706009X

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 $^{17}$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 $strong$ oxygen weak antiferromagnetism in edge-shared CuO$_2$ 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.

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