Phase Diagram of Lattice-Spin System RbCoBr${}_3$

Abstract

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.

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

References in corpus (3)

• Ordered Phases and Phase Transitions in The Stacked Triangular Ising Antiferromagnet CsCoCl${}_3$ and CsCoBr${}_3$
• A Simultaneous Magneto-Dielectric Phase Transition in RbCoBr${}_3$
• Ordered phase and phase transitions in the three-dimensional generalized six-state clock model

Cited by in corpus (2)

• Magnetic structure and phase diagram in a spin-chain system: Ca${}_3$Co${}_2$O${}_6$
• Spin-lattice model of Magneto-electric Transitions in RbCoBr${}_3$