Spin-lattice model of Magneto-electric Transitions in RbCoBr${}_3$

Abstract

Extensive Monte Carlo simulations are performed to analyze a recent neutron diffraction experiment on a distorted triangular lattice compound RbCoBr${}_3$. We consider a spin-lattice model, where both spin and lattice are Ising variables. This model explains well successive magnetic and dielectric transitions observed in the experiment. The exchange interaction parameters and the spin-lattice coupling are estimated. It is found that the spin-lattice coupling is important to explain the slow growth of a ferrimagnetic order. The present simulations were made possible by developing a new Monte Carlo algorithm, which accelerates slow Monte Carlo dynamics of quasi-one-dimensional frustrated systems.

11 pages, 11 figures

References in corpus (1)

• Ordered Phases and Phase Transitions in The Stacked Triangular Ising Antiferromagnet CsCoCl${}_3$ and CsCoBr${}_3$