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RESEARCH PRODUCT
General interpolation scheme for thermal fluctuations in superconductors
Luca MarottaMassimo CamardaFabio SiringoGiuseppe G. N. Angilellasubject
PhysicsSuperconductivityCondensed Matter - SuperconductivitysuperconductivityfluctuationsGaussianFOS: Physical sciencessuperconductivity; fluctuations; high-Tc superconductorsThermal fluctuationsCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsSuperconductivity (cond-mat.supr-con)symbols.namesakeVariational methodMean field theoryQuantum electrodynamicshigh-Tc superconductorssymbolsGinzburg–Landau theoryStatistical physicsGauge theorySuperconductivity phenomenological theoriesInterpolation theorydescription
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 behaviour 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-01-01 | Physical Review B |