Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Crossover from Thermal Activation to Quantum Interlayer Transport at the
  Superconducting Transition Temperature of Bi-2212   We perform a detailed study of temperature, bias and doping dependance of
interlayer transport in the layered high temperature superconductor
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$. We observe that the shape of interlayer
characteristics in underdoped crystals exhibit a remarkable crossover at the
superconducting transition temperature: from thermal activation-type at
$T>T_c$, to almost $T-$independent quantum tunneling-type, at $T<T_c$. Our data
indicates that the interlayer transport mechanism may change with doping: from
the conventional single quasiparticle tunneling in overdoped, to a
progressively increasing Cooper pair contribution in underdoped crystals.

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The categories of this paper are: stat
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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: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat