Breakdown of a Magnetization Plateau due to Anisotropy in Heisenberg Mixed-Spin Chains
Statistical Mechanics
2009-10-31 v1 Strongly Correlated Electrons
Abstract
We discuss the critical behavior of the spin-(1,1/2) Heisenberg ferrimagnetic chain in a magnetic field, whose magnetization curve exhibits a plateau at a third of the full magnetization. A bond alternation stabilizes the massive state, whereas an exchange anisotropy causes the breakdown of the plateau and the onset of a gapless spin-fluid state, where the transition, lying in the XY but ferromagnetic region, is of Kosterlitz-Thouless type. In order to elucidate significant quantum effects, we investigate the model of classical version as well.
Keywords
Cite
@article{arxiv.cond-mat/9905311,
title = {Breakdown of a Magnetization Plateau due to Anisotropy in Heisenberg Mixed-Spin Chains},
author = {Shoji Yamamoto and Toru Sakai},
journal= {arXiv preprint arXiv:cond-mat/9905311},
year = {2009}
}
Comments
7 pages, 9 figures embedded, to appear in J. Phys.: Condens. Matter