Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superfluid density in gapless superconductor CeCoIn5   Temperature dependence of the London penetration depth $\lambda$ measured in
single crystals of CeCoIn$_5$ is interpreted as caused by a strong
pair-breaking scattering that makes the superconductivity in this compound
gapless. For a gapless d-wave superconductor, we derive
$\lambda=\lambda_0/\sqrt{1-(T/T_c)^2}$ caused by combined effect of magnetic
and non-magnetic scattering in excellent agreement with the data in the full
temperature range and with the gapless s-wave case of Abrikosov and Gor'kov. We
also obtain the slope of the upper critical field at $T_c$ that compares well
with the measured slope.

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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
7
The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
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The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: econ