Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin Excitations in Half-Doped Manganites   We investigate magnetic excitations in half-doped colossal magnetoresistance
manganites. In particular, we focus on spin excitations in the CE phase
originally proposed by Goodenough (Phys. Rev. 100, 564 (1955)). Using a
localized spin model we calculated magnons for 3D-perovskite compounds such as
La$_{1-x}$M$_x$MnO$_3$, where M=Ca,Sr,Ba, and for their 2D-laminar
counterparts. We compared them with predictions for the spin excitations
corresponding to other phases proposed. For the laminar half-doped manganite
La$_{0.5}$Sr$_{1.5}$MnO$_4$, for which magnon measurements by inelastic neutron
scattering exist, as well as an estimation of the magnetic couplings, our
calculations agree well with the experimental data.

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The categories of this paper are: quant-ph
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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: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con