Microscopic model and phase diagrams of the multiferroic perovskite manganites

Masahito Mochizuki, Nobuo Furukawa

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

Orthorhombically distorted perovskite manganites, RMn O3 with R being a trivalent rare-earth ion, exhibit a variety of magnetic and electric phases including multiferroic (i.e., concurrently magnetic and ferroelectric) phases and fascinating magnetoelectric phenomena. We theoretically study the phase diagram of RMn O3 by constructing a microscopic spin model, which includes not only the superexchange interaction but also the single-ion anisotropy (SIA) and the Dzyaloshinsky-Moriya interaction (DMI). Analysis of this model using the Monte Carlo method reproduces the experimental phase diagrams as functions of the R -ion radius, which contain two different multiferroic states, i.e., the ab -plane spin cycloid with ferroelectric polarization P□a and the bc -plane spin cycloid with P□c. The orthorhombic lattice distortion or the second-neighbor spin exchanges enhanced by this distortion exquisitely controls the keen competition between these two phases through tuning the SIA and DMI energies. This leads to a lattice-distortion-induced reorientation of P from a to c in agreement with the experiments. We also discuss spin structures in the A -type antiferromagnetic state, those in the cycloidal spin states, origin and nature of the sinusoidal collinear spin state, and many other issues.

Original languageEnglish
Article number134416
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number13
DOIs
Publication statusPublished - 2009 Oct 19
Externally publishedYes

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Manganites
Perovskite
Phase diagrams
diagrams
phase diagrams
Ions
cycloids
Ferroelectric materials
Anisotropy
ions
Rare earths
anisotropy
Monte Carlo methods
Tuning
spin exchange
interactions
Polarization
retraining
Monte Carlo method
perovskite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Microscopic model and phase diagrams of the multiferroic perovskite manganites. / Mochizuki, Masahito; Furukawa, Nobuo.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 13, 134416, 19.10.2009.

Research output: Contribution to journalArticle

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