Fluctuations in a Small Superconducting Grain
In this paper we discuss the fluctuations of the order parameter in a single small superconducting grain. Besides the general interest in this problem,1,2 it also applies to an assembly of grains with negligible interactions among them and is thus the first step in discussing granular superconductors.1,3 The specific heat4 does not show any singular behavior in the critical region, and the smearing of the phase transition due to the finite size is in agreement with a recent theory.5 We derive a scaling law between the 3D (three-dimensional) and 0D (zero-dimensional) indices.6 For the dc paraconductivity our 0D predictions agree with the Aslamazov-Larkin result and do not agree with the result of Ref. 2.
KeywordsCritical Region Zero Dimension Negligible Interaction Granular Superconductor Free Energy Equation
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