Magnetoelectric transitions of a distorted triangular-lattice antiferromagnet in a magnetic field

Tota Nakamura
Phys. Rev. B 84, 054429 – Published 9 August 2011

Abstract

Large-scale Monte Carlo simulations are performed to analyze magnetoelectric transitions of a spin-lattice model in a magnetic field. The model explains well an experimental field-temperature phase diagram of RbCoBr3. The magnetic structure in each phase is determined. Simultaneous magnetoelectric transitions observed in the zero-field case are found to occur only in the low-field region, whereas magnetic transitions and electric transitions are decoupled in the high-field region. When the spin-lattice correlation is weak, an asymmetric ferrimagnetic state and a half-ferrimagnetic state appear. The former is the intermediate state between the partial-disordered state and the ferrimagnetic state. The latter phase is characterized by a sublattice order parameter with a 2-2- ordering pattern.

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  • Received 6 March 2011

DOI:https://doi.org/10.1103/PhysRevB.84.054429

©2011 American Physical Society

Authors & Affiliations

Tota Nakamura

  • College of Engineering, Shibaura Institute of Technology, Minuma-ku, Saitama 330-8570, Japan

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Issue

Vol. 84, Iss. 5 — 1 August 2011

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