Phase Diagram of Lattice-Spin System RbCoBr$_3$

Details Phase Diagram of Lattice-Spin System RbCoBr$_3$ Phase Diagram of Lattice-Spin System RbCoBr$_3$

2005-12-15

arxiv.org/abs/cond-mat/0512332v1

J. Phys. Soc. Jpn. Vol.75 (2006) 024708

Physics

Condensed Matter

Other Condensed Matter

5 pages, 4 figures, jpsj2.cls, to be published in J. Phys. Soc. Jpn. Vol.75 (2006) No. 2

Scientific paper

10.1143/JPSJ.75.024708

We study the lattice-spin model of RbCoBr$_3$ 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.

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