Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase diagrams of singlet superconducting states with mixed symmetry   The competition between the singlet superconducting states with $s$- and
d-wave symmetry of the order parameter is studied within a single-band model
with nearest-neighbor attractive interaction. The zero- and finite-temperature
ground state phase diagrams are constructed for different ratios between the
nearest- and next-nearest-neighbor electron transfer integrals. The mixed
$s+id$ pairing state is shown to form in the intermediate region between $s$-
and d-waves. The temperature phase transitions between the pure and the mixed
pairing state are found.

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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ