Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: S-wave Superconductivity in Optimally Doped SrTi$_{1-x}$Nb$_x$O$_3$
  Unveiled by Electron Irradiation   We report on a study of electric resistivity and magnetic susceptibility
measurements in electron irradiated SrTi$_{0.987}$Nb$_{0.013}$O$_3$ single
crystals. Point-like defects, induced by electron irradiation, lead to an
almost threefold enhancement of the residual resistivity, but barely affect the
superconducting critical temperature ($T_c$). The pertinence of Anderson's
theorem provides strong evidence for a s-wave superconducting order parameter.
Stronger scattering leads to a reduction of the effective coherence length
($\xi$) and the deduced coherence length in the clean limit ($\xi_0$) is around
the BCS coherence length ($\xi_{BCS}$). Combined with thermal conductivity data
pointing to multiple nodeless gaps, the current results identify optimally
doped SrTi$_{1-x}$Nb$_x$O$_3$ as a multi-band s-wave superconductor.

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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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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: q-bio
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The categories of this paper are: quant-ph