Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical properties and electronic structure of Sr$_2$Cr$_3$As$_2$O$_2$
  containing CrO$_2$ and Cr$_2$As$_2$ square-planar lattices   We report the physical properties and electronic structure calculations of a
layered chromium oxypnictide, Sr$_2$Cr$_3$As$_2$O$_2$, which crystallizes in a
Sr$_2$Mn$_3$As$_2$O$_2$-type structure containing both CrO$_2$ planes and
Cr$_2$As$_2$ layers. The newly synthesized material exhibits a metallic
conduction with a dominant electron-magnon scattering. Magnetic and
specific-heat measurements indicate at least two intrinsic magnetic transitions
below room temperature. One is an antiferromagnetic transition at 291 K,
probably associated with a spin ordering in the Cr$_2$As$_2$ layers. Another
transition is broad, occurring at around 38 K, and possibly due to a
short-range spin order in the CrO$_2$ planes. Our first-principles calculations
indicate predominant two-dimensional antiferromagnetic exchange couplings, and
suggest a KG-type (i.e. K$_2$NiF$_4$ type for CrO$_2$ planes and G type for
Cr$_2$As$_2$ layers) magnetic structure, with reduced moments for both Cr
sublattices. The corresponding electronic states near the Fermi energy are
mostly contributed from Cr-3$d$ orbitals which weakly (modestly) hybridize with
the O-2$p$ (As-4$p$) orbitals in the CrO$_2$ (Cr$_2$As$_2$) layers. The bare
bandstructure density of states at the Fermi level is only $\sim$1/4 of the
experimental value derived from the low-temperature specific-heat data,
consistent with the remarkable electron-magnon coupling. The title compound is
argued to be a possible candidate to host superconductivity.

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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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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: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg