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Condens. Matter 2018, 3(4), 28; https://doi.org/10.3390/condmat3040028

A Monte-Carlo Study on the Coupling of Magnetism and Ferroelectricity in the Hexagonal Multiferroic RMnO3

Physics Department, University of Virginia, Charlottesville, VA 22904, USA
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Received: 15 August 2018 / Revised: 16 September 2018 / Accepted: 18 September 2018 / Published: 20 September 2018
(This article belongs to the Special Issue New Trends in Quantum Complex Matter)
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Abstract

The ferroelectric phase transition in RMnO3 breaks both Z3 and Z2 symmetries, giving rise to 6 structural domains. Topological protected vortices are formed at the junctions of all 6 domains, and the ferroelectric phase transition is closely related to these Z6 vortices. In this work, Monte-Carlo studies on both the ferroelectric and magnetic transition have been performed on RMnO3 system. The magnetic simulation results on lattices with different structural domain distributions induced by external electric field and simulated quenching show different magnetic transition temperature T s , indicating that the coupling of magnetism and ferroelectricity is through the Z6 structural domain. At extreme case, lattice quenched from above the ferroelectric transition results in high vortex density, which can drive the system into spin glass. View Full-Text
Keywords: multiferroics; Monte-Carlo simulation; Z6 symmetry breaking multiferroics; Monte-Carlo simulation; Z6 symmetry breaking
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Duan, C.; Chern, G.-W.; Louca, D. A Monte-Carlo Study on the Coupling of Magnetism and Ferroelectricity in the Hexagonal Multiferroic RMnO3. Condens. Matter 2018, 3, 28.

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