Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coulomb Gap and Correlated Vortex Pinning in Superconductors   The positions of columnar pins and magnetic flux lines determined from a
decoration experiment on BSCCO were used to calculate the single--particle
density of states at low temperatures in the Bose glass phase. A wide Coulomb
gap is found, with gap exponent $s \approx 1.2$, as a result of the long--range
interaction between the vortices. As a consequence, the variable--range hopping
transport of flux lines is considerably reduced with respect to the
non--interacting case, the effective Mott exponent being enhanced from $p_0 =
1/3$ to $p_{\rm eff} \approx 0.5$ for this specific experiment.

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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat