Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-07-12
Phys. Rev. Lett. 105, 037205 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, typos corrected
Scientific paper
10.1103/PhysRevLett.105.037205
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.
Furukawa Nobuo
Mochizuki Masahito
Nagaosa Naoto
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