[en] 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 [Phys. Rev. B 85, 184506 (2012)].
Disciplines :
Physics
Author, co-author :
Motta, M.; Universidade Federal de Sao Carlos, Brazil
Colauto, F.; Universidade Federal de Sao Carlos, Brazil
Ortiz, W.A.; Universidade Federal de Sao Carlos, Brazil
Fritzsche, J.; Chalmers University of Technology, Sweden
Cuppens, J.; Katholieke Universiteit Leuven - KUL
Gillijns, W.; Katholieke Universiteit Leuven - KUL
Moshchalkov, V.V.; Katholieke Universiteit Leuven - KUL
Johansen, T.H.; University of Oslo, Norway
Sanchez, A.
Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique de la matière condensée
Language :
English
Title :
Enhanced pinning in superconducting thin films with graded pinning landscapes
Publication date :
30 May 2013
Journal title :
Applied Physics Letters
ISSN :
0003-6951
eISSN :
1077-3118
Publisher :
American Institute of Physics, Melville, United States - New York
Volume :
102
Pages :
212601
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ULg - University of Liège F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding text :
This work was partially supported by the Brazilian funding agencies FAPESP and CNPq, the Methusalem Funding of the Flemish Government, the Fund for Scientific Research-Flanders (FWO-Vlaanderen), the program for scientific cooperation F.R.S.-FNRS-CNPq, and Spanish projects
CSD2007-00041 and MAT2012-35370. The work of A.V.S. was partially supported by “Mandat d’Impulsion Scientifique” of the F.R.S.-FNRS and the crédit de démarrage U.Lg.
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