Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deviation from the Wiedemann-Franz law induced by nonmagnetic impurities
  in overdoped La_{2-x}Sr_{x}CuO_{4}   To investigate the validity of the Wiedemann-Franz (WF) law in disordered but
metallic cuprates, the low-temperature charge and heat transport properties are
carefully studied for a series of impurity-substituted and carrier-overdoped
La_{1.8}Sr_{0.2}Cu_{1-z}M_zO_4 (M = Zn or Mg) single crystals. With moderate
impurity substitution concentrations of z = 0.049 and 0.082 (M = Zn), the
resistivity shows a clear metallic behavior at low temperature and the WF law
is confirmed to be valid. With increasing impurity concentration to z = 0.13 (M
= Zn) or 0.15 (M = Mg), the resistivity shows a low-T upturn but its
temperature dependence indicates a finite conductivity in the T \to 0 limit. In
this weakly-localized metallic state that is intentionally achieved in the
overdoped regime, a {\it negative} departure from the WF law is found, which is
opposite to the theoretical expectation.

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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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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: chao-dyn
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The categories of this paper are: atom-ph