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Influence of the interface roughness on Jc of Ge/Pb/Ge sandwiches

✍ Scribed by K. Temst; M. Baert; E. Rosseel; M. Dhallé; C.D. Potter; V.V. Moshchalkov; C. Van Haesendonck; Y. Bruynseraede; V.V. Metlushko; G. Güntherodt; L. Hellemans; J. Snauwaert

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
140 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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✦ Synopsis

Critical current densities Jr for fields applied perpendicular to MBE prepared Ge/Pb/Ge sandwiches and bare Pb films have been obtained from magnetization measurements. The single Pb film shows smooth magnetization loops at all temperatures and a monotonous decrease of Jr with rising temperature. The Ge/Pb/Ge sandwiches reveal peaks in the magnetization curves at lower temperatures and become smooth only in the vicinity of T¢ ('--7K). 3c(T) for the sandwiches shows a well defined maximum at approximately 5K. As a result, the Jr values of this sandwich are increased by a factor of 3 in the temperature range 5-7K. This different behaviour may be due to enhanced pinning at the Ge-Pb interfaces, which were studied using Atomic Force Microscopy (AFM).

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