Reference : Superconductivity fluctuations in Bi(Pb) based granular ceramics superconductors: evi...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Superconductivity fluctuations in Bi(Pb) based granular ceramics superconductors: evidence for fractal behavior
Ausloos, Marcel mailto [Université de Liège - ULiège > Département de physique > Département de physique > >]
Laurent, Christian [Université de Liège - ULiège > Institut d'Electricité Montefiore B28 > S.U.P.R.A.S. > >]
Patapis, S. K. [> > > >]
Politis, C. [> > > >]
Luo, H. L. [> > > >]
Godelaine, P. A. [> > > >]
Gillet, François [Université de Liège - ULiège > Département des sciences de la vie > Génétique]
Dang, A. [> > > >]
Cloots, Rudi mailto [Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT]
Zeitschrift für Physik. B, Condensed Matter
Yes (verified by ORBi)
[en] We report precise measurements of the electrical resistivity in three different Bi(Pb) based granular ceramics superconductors. We show that a single critical exponent (5/6) describes the superconductivity fluctuations. Such a critical exponent indicates a fractal behavior of the superconducting path. Our results thus indicate a strict two dimensional fluctuation percolation set (below the superconductivity onset temperature 195 K down to T(c)), and provide some proof for Tarascon et al. "shell conductivity path" hypothesis. We estimate the shell thickness to be of the order of 10 angstrom.
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