EVIDENCE FOR MEAN FREE-PATH FLUCTUATION-INDUCED PINNING IN YBA2CU3O7 AND YBA2CU4O8 FILMS

Authors
GRIESSEN R WEN HH VANDALEN AJJ DAM B RECTOR J SCHNACK HG LIBBRECHT S OSQUIGUIL E BRUYNSERAEDE Y
Citation
R. Griessen et al., EVIDENCE FOR MEAN FREE-PATH FLUCTUATION-INDUCED PINNING IN YBA2CU3O7 AND YBA2CU4O8 FILMS, Physical review letters, 72(12), 1994, pp. 1910-1913
Citations number
26
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
72
Issue
12
Year of publication
1994
Pages
1910 - 1913
Database
ISI
SICI code
0031-9007(1994)72:12<1910:EFMFFP>2.0.ZU;2-9
Abstract
The critical current j(c) and the pinning energy U(c) have been determ ined for three types of yttrium-based superconducting films from curre nt j(s) and dynamic relaxation Q-dlnj(s)/dln(dB/dt) data by means of t he generalized inversion scheme. For B < 2 T and T < 80 K the temperat ure dependence of j(c) and U(c) for all films is found to be in excell ent agreement with a model of single vortices pinned by randomly distr ibuted weak pinning centers via spatial fluctuations of the charge car rier mean free path. Pinning due to spatial fluctuations of T(c) is no t observed.