Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductivity in Epitaxial Thin Films of Co-Doped SrFe2As2 with
  Bilayered FeAs Structures and their Magnetic Anisotropy   Superconducting epitaxial films of Fe-based layered arsenide, Co-doped
SrFe2As2, were grown at 700oC on mixed perovskite (La, Sr)(Al, Ta)O3 (001)
single-crystal substrates by pulsed-laser deposition. Both the epitaxial film
and an (001)-oriented film grown at 600oC exhibited superconducting transitions
at ~ 20 K. The zero-resistance states of the epitaxial film were sustained
under a magnetic field (H) of 9 T at 9 K when H was parallel to the c-axis,
while they were sustained at higher temperatures up to 10 K for H parallel to
the a-axis. This is the first demonstration of superconducting thin films of
FeAs-based new superconductors.

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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
16
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: eess
20
The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
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The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph