Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbital-Spin Structure and Coupling to Lattice in RTiO$_3$ with
  R=La,Pr,Nd and Sm   The origin of the G-type antiferromagnetism (AFM(G)) and puzzling properties
of RTiO$_3$ with R=La are studied. We clarify that the crystal field from La
caused by the GdFeO$_3$-type distortion lifts the $t_{2g}$ degeneracy at Ti 3d
orbitals. The lift stabilizes the AFM(G) with spin-exchange constant in
agreement with neutron scattering results. The orbital-spin structures for
R=Pr, Nd and Sm are also consistent with experiments. We propose that the
GdFeO$_3$-type distortion has a universal mechanism of controlling orbital-spin
structure competing with the Jahn-Teller (JT) mechanism.

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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an