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Enhanced pinning in superconducting thin films with graded pinning landscapes

M. Motta ; F. Colauto ; W. A. Ortiz ; Joachim Fritzsche (Institutionen för teknisk fysik, Kemisk fysik) ; J. Cuppens ; W. Gillijns ; V. V. Moshchalkov ; T. H. Johansen ; A. Sanchez ; A. V. Silhanek
Applied Physics Letters (0003-6951). Vol. 102 (2013), 21,
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2013-08-05. Senast ändrad 2017-10-06.
CPL Pubid: 180493


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)


Teknisk fysik

Chalmers infrastruktur