Coupled $S=1/2$ Heisenberg antiferromagnetic chains in an effective staggered field
Abstract
We present a systematic study of coupled Heisenberg antiferromagnetic chains in an effective staggered field. We investigate several effects of the staggered field in the {\em higher} ({\em two or three}) {\em dimensional} spin system analytically. In particular, in the case where the staggered field and the inter-chain interaction compete with each other, we predict, using mean-field theory, a characteristic phase transition. The spin-wave theory predicts that the behavior of the gaps induced by the staggered field is different between the competitive case and the non-competitive case. When the inter-chain interactions are sufficiently weak, we can improve the mean-field phase diagram by using chain mean-field theory and the analytical results of field theories. The ordered phase region predicted by the chain mean-field theory is substantially smaller than that by the mean-field theory.
Keywords
Cite
@article{arxiv.cond-mat/0401627,
title = {Coupled $S=1/2$ Heisenberg antiferromagnetic chains in an effective staggered field},
author = {Masahiro Sato and Masaki Oshikawa},
journal= {arXiv preprint arXiv:cond-mat/0401627},
year = {2009}
}
Comments
13pages, 12figures, to be published in PRB