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Current crowding effects in superconducting corner-shaped Al microstrips

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Adami, O.-A. [Université de Liège] Cerbu, D. [INPAC - K.U.Leuven] Cabosart, Damien [UCL] Motta, M. [Universidade Federal de Sao Carlos] Cuppens, J. [INPAC - K.U.Leuven] Hackens, Benoît [UCL] Delamare, Romain [UCL] Silhanek, A.V. [Université de Liège]

The superconducting critical current of corner-shaped Al superconducting microstrips has been investigated. We demonstrate that the sharp turns lead to asymmetric vortex dynamics, allowing for easier penetration from the inner concave angle than from the outer convex angle. This effect is evidenced by a rectification of the voltage signal otherwise absent in straight superconducting strips. At low magnetic fields, an enhancement of the critical current with increasing magnetic field is observed for a particular combination of field and current polarity, confirming a theoretically predicted competing interplay of superconducting screening currents and applied currents at the inner side of the turn.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2013
Language Anglais
Journal information "Applied Physics Letters" - Vol. 102, no. 5, p. 052603 1-4 (2013)
Peer reviewed yes
Publisher American Institute of Physics ((United States) [S.l.])
issn 0003-6951
e-issn 1077-3118
Publication status Publié
Affiliations UCL - SST/IMCN/NAPS - Nanoscopic Physics
UCL - SST/ICTM/ELEN - Pôle en ingénierie électrique
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Bibliographic reference Adami, O.-A. ; Cerbu, D. ; Cabosart, Damien ; Motta, M. ; Cuppens, J. ; et. al. Current crowding effects in superconducting corner-shaped Al microstrips. In: Applied Physics Letters, Vol. 102, no. 5, p. 052603 1-4 (2013)
Permanent URL http://hdl.handle.net/2078/123836