Magnetoresistance measurements in high temperature superconductors as a sensitive probe for inhomogeneities of the critical temperature

Autor(en)

W. Lang

Abstrakt

A phenomenological model which considers the effect of a non-uniform critical temperature on the thermodynamic fluctuation contributions to the paraconductivity and to the magnetoresistance is presented. Assuming a Gaussian distribution of critical temperatures, only a small change of the paraconductivity, but a significant enhancement of the fluctuation magnetoconductivity is predicted in the vicinity of T-c. The present model is compared with recent measurements of the magnetoresistance in thin films of (Bi,Pb)(2)Sr2Ca2Cu3Ox. It is shown that an analysis of the magnetoresistance provides a sensitive method for the detection of a non-uniform T-c and also an estimation of the width of the T-c-distribution function.

Organisation(en)

Elektronische Materialeigenschaften

Journal

Physica C: Superconductivity and its Applications

Band

235

Seiten

1447-1448

Anzahl der Seiten

2

ISSN

0921-4534

DOI

https://doi.org/10.1016/0921-4534(94)91948-8

Publikationsdatum

1994

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/14c49297-767b-4ae0-bb6e-bb711e28905f