Spin model of magnetostrictions in multiferroic Mn perovskites

Abstract

We theoretically study origins of the ferroelectricity in the multiferroic phases of the rare-earth (R) Mn perovskites, RMnO3, by constructing a realistic spin model including the spin-phonon coupling, which reproduces the entire experimental phase diagram in the plane of temperature and Mn-O-Mn bond angle for the first time. Surprisingly we reveal a significant contribution of the symmetric (S.S)-type magnetostriction to the ferroelectricity even in a spin-spiral-based multiferroic phase, which can be larger than the usually expected antisymmetric (SxS)-type contribution. This explains well the nontrivial behavior of the electric polarization. We also predict the noncollinear deformation of the E-type spin structure and a wide coexisting regime of the E and spiral states, which resolve several experimental puzzles.

5 pages, 4 figures, typos corrected

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Cited by in corpus (9)

• Recent Progress of Multiferroic Perovskite Manganites
• Long-Range Magnetic Interactions in the Multiferroic Antiferromagnet $\mathrm{MnW}{\mathrm{O}}_4$
• Robust Ferroelectric State in Multiferroic Mn${}_{1-x}$Zn${}_x$WO${}_4$
• Magnetic and multiferroic phases of single-crystalline Mn${}_{0.85}$Co${}_{0.15}$WO${}_4$
• Tuning the multiferroic mechanisms of TbMnO3 by epitaxial strain
• Spin dependence of ferroelectric polarization in the double exchange model for manganites
• Emergent phases in a compass chain with multisite interactions
• Energy dynamics in a generalized compass chain
• Quantum phase transitions of a generalized compass chain with staggered Dzyaloshinskii-Moriya interaction