Novel pinning phenomena in a superconducting film with a square lattice of artificial pinning centers

Details Novel pinning phenomena in a superconducting film with a square lattice of artificial pinning centers Novel pinning phenomena in a superconducting film with a square lattice of artificial pinning centers

2003-12-19

arxiv.org/abs/cond-mat/0312508v1

APL 84, 5371 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 4 figures

Scientific paper

10.1063/1.1767278

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 novel effect might indicate that the flux lines in the APC system change their flow mode as the dc current is increased.

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