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Short-wavelength fluctuation regime in paraconductivity of bulk monophase (Bi, Pb)-2223 superconductor system

A. HARABOR1,* , N. A. HARABOR2, M. DELETTER3

Affiliation

  1. Faculty of Physics, University of Craiova, 13 A. I. Cuza Str., Craiova-200585, Romania
  2. „Politehnica” University, Bucharest, Romania
  3. Centre de Recherche de la Céramique, Mons, Belgium

Abstract

The Aslamasov-Larkin contribution of the excess-conductivity, calculated within the Lorentz-Doniach model shows that a crossover from 3D to 2D dimensionality is taken place at about 110.41K for our bulk monophase (Bi, Pb)-2223 samples. A bending of the log-log curves from 2D behavior through those of SWF (short wavelength fluctuation) behavior was also observed at a temperature about 135.43K (far from Tcm). The theoretical fits are also consistent with the following formula for paraconductivity (∆σ=(e2/16 ћs)f(ε)) expressed in terms of so called universal function f(ε), where ε= ln(T/Tc). In the Ginzburg-Landau region ( 1 << ε ) we take f(ε) =1/ε, but in the SWF region ( 1 >> ε ) we have f(ε)=1/ε3..

Keywords

Superconductivity, Paraconductivity, (Bi, Pb)2223 system.

Submitted at: March 15, 2006
Accepted at: May 18, 2006

Citation

A. HARABOR, N. A. HARABOR, M. DELETTER, Short-wavelength fluctuation regime in paraconductivity of bulk monophase (Bi, Pb)-2223 superconductor system, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 1072-1076 (2006)