Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reflectivity measurements in uniaxial superconductors: a methodological
  discussion applied to the case of La(2-x)Sr(x)CuO(4)   Most of the novel superconductors are uniaxial crystals, with metallic planes
($ab$) orthogonal to an insulating axis ($c$). Far-infrared measurements of the
reflectivity $R_{ab} (\omega)$ provide valuable information on their low-energy
electrodynamics, but involve delicate experimental issues. Two of them are a
possible contamination of $R_{ab} (\omega)$ from the c axis and the
extrapolation of the $R_{ab}$ data to $\omega$ =0, both above and below $T_c$.
Here we discuss quantitatively these issues with particular regard to
La$_{2-x}$Sr$_x$CuO$_{4+y}$, one of the most studied high-$T_c$ materials.

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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
3
The categories of this paper are: physics
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The categories of this paper are: dg-ga