Influence of a Distribution of Critical Temperatures on the Paraconductivity and the Fluctuation Magnetoconductivity in High-Temperature Superconductors

Autor(en)

W. Lang

Abstrakt

A phenomenological model which considers the effect of a non-uniform critical temperature on the various thermodynamic fluctuation contributions to the paraconductivity and to the magnetoconductivity is presented. Assuming a Gaussian distribution of critical temperatures, only a small change of the paraconductivity, but a significant enhancement of the fluctuation magnetoconductivity was found in the vicinity of T(c). The shape of the magnetic field dependence of the fluctuation magnetoresistance is substantially changed, in particular the quadratic region of the low-field limit is shifted to smaller magnetic fields. The present results are compared with recent experimental findings in thin films of (Bi, Pb)2Sr2Ca2Cu3Ox and consequences for an analysis of the dimensional crossover in the layered superconductor model are discussed.

Organisation(en)

Elektronische Materialeigenschaften

Journal

Physica C: Superconductivity and its Applications

Band

226

Seiten

267-278

Anzahl der Seiten

12

DOI

https://doi.org/10.1016/0921-4534(94)90205-4

Publikationsdatum

1994

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/f327c4ea-5abb-4fd7-baab-7631e3266926