Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nodeless superconductivity in the infinite-layer electron-doped
  Sr_0.9La_0.1CuO_2 cuprate superconductor   We report on measurements of the in-plane magnetic penetration depth
\lambda_{ab} in the infinite-layer electron-doped high-temperature cuprate
superconductor Sr_0.9La_0.1CuO_2 by means of muon-spin rotation. The observed
temperature and magnetic field dependences of \lambda_{ab} are consistent with
the presence of a substantial s-wave component in the superconducting order
parameter in good agreement with the results of tunneling, specific heat, and
small-angle neutron scattering experiments.

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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: econ
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas