Evidence for mean free path fluctuation induced pinning in YBa2Cu3O7 and YBa2Cu4O8 films

R. Griessen*, Hai-Hu Wen Hai-Hu, A. J.J. Van Dalen, B. Dam, J. Rector, H. G. Schnack, S. Libbrecht, E. Osquiguil, Y. Bruynseraede

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

281 Citations (Scopus)

Abstract

The critical current jc and the pinning energy Uc have been determined for three types of yttrium-based superconducting films from current js and dynamic relaxation Q=d lnjs/d ln(dB/dt) data by means of the generalized inversion scheme. For B<2 T and T<80 K the temperature dependence of jc and Uc for all films is found to be in excellent agreement with a model of single vortices pinned by randomly distributed weak pinning centers via spatial fluctuations of the charge carrier mean free path. Pinning due to spatial fluctuations of Tc is not observed.

Original languageEnglish
Pages (from-to)1910-1913
Number of pages4
JournalPhysical Review Letters
Volume72
Issue number12
DOIs
Publication statusPublished - 1994

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