Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Robust Half-Metallic Character and Large Oxygen Magnetism in a
  Perovskite Cuprate   The new perovskite cuprate material Sr$_{8}$CaRe$_{3}$Cu$_{4}$O$_{24}$, which
behaves ferrimagnetically and shows an unusually high Curie temperature ($T_c
\sim$ 440 K), is found from density-functional theory calculation to display
several surprising properties after hole doping or chemical substitution: (1)
Half metal (HM) is realized by replacing Re with W or Mo while $T_c$ remains
high; (2) hole-doped Sr$_{8}$CaRe$_{3}$Cu$_{4}$O$_{24}$ is also HM with high
$T_c$. Moreover, we find that the O atoms will carry a large magnetic moment
after hole doping, which is in sharp contrast with the generally accepted
concept that magnetism in solid requires partially filled shells of $d$ or $f$
electrons in cations. The material Sr$_8$CaRe$_3$Cu$_4$O$_{24}$ is therefore
expected to provide a very useful platform for material design and development.

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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: math