Enhanced pinning in superconducting thin films with graded pinning landscapes
Artikel i vetenskaplig tidskrift, 2013
A graded distribution of antidots in superconducting a-Mo79Ge21 thin films has been investigated by magnetization and magneto-optical imaging measurements. The pinning landscape has maximum density at the sample border, decreasing linearly towards the center. Its overall performance is noticeably superior than that for a sample with uniformly distributed antidots: For high temperatures and low fields, the critical current is enhanced, whereas the region of thermomagnetic instabilities in the field-temperature diagram is significantly suppressed. These findings confirm the relevance of graded landscapes on the enhancement of pinning efficiency, as recently predicted by Misko and Nori.
Författare
M. Motta
Universidade Federal de Sao Carlos
F. Colauto
Universidade Federal de Sao Carlos
W. A. Ortiz
Universidade Federal de Sao Carlos
Joachim Fritzsche
Chalmers, Teknisk fysik, Kemisk fysik
J. Cuppens
KU Leuven
W. Gillijns
KU Leuven
V. V. Moshchalkov
KU Leuven
T. H. Johansen
Universitetet i Oslo
University of Wollongong
A. Sanchez
Universitat Autonoma de Barcelona (UAB)
A. V. Silhanek
Universite de Liège
Applied Physics Letters
0003-6951 (ISSN) 1077-3118 (eISSN)
Vol. 102 21 212601Ämneskategorier
Annan teknik
DOI
10.1063/1.4807848