General interpolation scheme for thermal fluctuations in superconductors

L. Marotta; M. Camarda; G. G. N. Angilella; F. Siringo

doi:10.1103/PhysRevB.73.104517

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General interpolation scheme for thermal fluctuations in superconductors

L. Marotta, M. Camarda, G. G. N. Angilella, F. Siringo

DOI 10.1103/PhysRevB.73.104517 · Physical Review B

T1

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Abstract

We present a general interpolation theory for the phenomenological effects of thermal fluctuations in superconductors. Fluctuations are described by a simple gauge invariant extension of the Gaussian effective potential for the Ginzburg-Landau static model. The approach is shown to be a genuine variational method, and to be stationary for infinitesimal gauge variations around the Landau gauge. Correlation and penetration lengths are shown to depart from the mean field behavior in a more or less wide range of temperature below the critical regime, depending on the class of material considered. The method is quite general and yields a very good interpolation of the experimental data for very different materials.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown