Phase Diagram of Lattice-Spin System RbCoBr$_3$
Abstract
We study the lattice-spin model of RbCoBr which is proposed by Shirahata and Nakamura, by mean field approximation. This model is an Ising spin system on a distorted triangular lattice. There are two kinds of frustrated variables, that is, the lattice and spin. We obtain a phase diagram of which phase boundary is drawn continuously in a whole region. Intermediate phases that include a partial disordered state appear. The model has the first-order phase transitions in addition to the second-order phase transitions. We find a three-sublattice ferrimagnetic state in the phase diagram. The three-sublattice ferrimagnetic state does not appear when the lattice is not distorted.
Keywords
Cite
@article{arxiv.cond-mat/0512332,
title = {Phase Diagram of Lattice-Spin System RbCoBr$_3$},
author = {Yoichi Nishiwaki and Norikazu Todoroki},
journal= {arXiv preprint arXiv:cond-mat/0512332},
year = {2009}
}
Comments
5 pages, 4 figures, jpsj2.cls, to be published in J. Phys. Soc. Jpn. Vol.75 (2006) No. 2