Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing inhomogeneities in type II superconductors by means of thermal
  fluctuations, magnetic fields and isotope effects   Type II superconductors, consisting of superconducting domains embedded in a
normal or insulating matrix, undergo a rounded phase transition. Indeed, the
correlation length cannot grow beyond the spatial extent of the domains.
Accordingly, the thermodynamic properties will exhibit a finite size effect. It
is shown that the specific heat and penetration depth data of a variety of type
II superconductors, including cuprates, exhibit the characteristic properties
of a finite size effect, arising from domains with nanoscale extent. The finite
size scaling analysis reveals essential features of the mechanism. Transition
temperature and superfluidity increase with reduced domain size. The combined
finite size and isotope effects uncover the relevance of local lattice
distortions

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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
16
The categories of this paper are: stat
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The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
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The categories of this paper are: nlin
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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
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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: hep-th
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The categories of this paper are: econ