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Title: Pinning phenomena in a superconducting film with a square lattice of artificial pinning centers
Authors: Jiang, Z ×
Dikin, DA
Chandrasekhar, V
Metlushko, VV
Moshchalkov, Victor #
Issue Date: 2004
Publisher: AMER INST PHYSICS
Series Title: Applied Physics Letters vol:84 issue:26 pages:5371-5373
Conference: date:Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA; Univ Illinois, Dept Elect Engn & Comp Sci, Chicago, IL 60607 USA; Katholieke Univ Leuven, Dept Phys & Astron, Louvain, Belgium
Abstract: We study the transport properties of a superconducting Nb film with a square lattice of artificial pinning centers (APCs) as a function of dc current, at a temperature close to the superconducting transition temperature of the film. We find that, at low dc currents, the differential resistance of the film shows the standard matching field anomaly, that is, the differential resistance has a local minimum at magnetic fields corresponding to an integer number of flux lines per APC. However, at higher dc currents, the differential resistance at each matching field turns to a local maximum, which is exactly opposite to the low current behavior. This effect might indicate that the flux lines in the APC system change their flow mode as the dc current is increased. (C) 2004 American Institute of Physics.
ISSN: 0003-6951
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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