Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin model of magnetostrictions in multiferroic Mn perovskites   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.

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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th