Volume 60, Number 2, October 2002
|Page(s)||295 - 301|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 October 2002|
Increase of the critical current at the liquid-helium lambda point in superconducting perforated multilayers
Dipartimento di Fisica “E. R. Caianiello” and INFM Università degli Studi di Salerno - Baronissi (Salerno), I-84081, Italy
2 State University of Informatics and Radio Electronics P.Brovka street 6, Minsk 220013, Belarus
3 Dipartimento di Fisica, Università degli Studi di Cagliari Cagliari, I-09042, Italy
4 IESS-CNR - Via Cineto Romano 42, Roma, I-00100, Italy
Accepted: 26 July 2002
Pinning properties of multilayers with regular array of antidots have been studied at different temperatures in perpendicular magnetic field. The presence of antidots causes a sudden increase (jump) of the critical current at the liquid-helium lambda point ( ). The jump value is a function of magnetic field and sample anisotropy. The hypothesis of liquid helium wetting the antidots below 2.18, and then inducing a larger pinning efficiency, is put forward.
PACS: 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.80.Dm – Superconducting layer structures: superlattices, heterojunctions, and multilayers
© EDP Sciences, 2002
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