Enhanced pinning in superconducting thin films with graded pinning landscapes
Motta, M. (Universidade Federal de Sao Carlos. Departamento de Física)
Colauto, F. (Universidade Federal de Sao Carlos. Departamento de Física)
Ortiz Vargas, Walter Andrés (Universidade Federal de Sao Carlos. Departamento de Física)
Fritzsche, J. (Chalmers University of Technology. Department of Applied Physics)
Cuppens, Jo (INPAC - Institute for Nanoscale Physics and Chemistry)
Gillijns, W. (INPAC - Institute for Nanoscale Physics and Chemistry)
Moshchalkov, V. V. (Katholieke Universiteit Leuven. Laboratorium voor Vaste-Stoffysica en Magnetisme)
Johansen, T. H. (University of Wollongong. Institute for Superconducting and Electronic Materials)
Sánchez Moreno, Álvaro (Universitat Autònoma de Barcelona. Departament de Física)
Silhanekz, A. V. (Université de Liège. Département de Physique)

Data:	2013
Resum:	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.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Applied physics letters, Vol. 102, Issue 21 (May 2013) , p. 212601-1/212601-4, ISSN 1077-3118

DOI: 10.1063/1.4807848

5 p, 1.2 MB

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