Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconducting Transition Temperature in Heterogeneous
  Ferromagnet-Superconductor Systems   We study the shift of the the superconducting transition temperature $T_c$ in
ferromagnetic-superconducting bi-layers and in a superconducting film supplied
a square array of ferromagnetic dots. We find that the transition temperature
in these two cases change presumably in opposite direction and that its change
is not too small. We extend these results to multilayer structures. We predict
that rather small external magnetic field $\sim 10$ Oe can change the
transition temperature of the bilayer by 10% .

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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin