Anomalous pinning enhancement during the superconducting-normal transition of -Song Yue, Bo Zhang, Shun Tan, Mingliang Tian and Yuheng Zhang
Structure Research Laboratory, University of Science and Technology of China and National High Magnetic Field Laboratory - Hefei, 230026, Anhui, PRC email@example.com
(Received 3 June 2003; accepted in final form 18 February 2004)
The magnetic-field dependence of the resistance ( R- H) of - was carefully measured. Accompanied by the superconducting-normal (S-N) transition, a small resistance dip emerges near the upper critical field . This anomaly was consolidated by that of the critical current, which presents a shoulder in the - H curve at the corresponding field. We tentatively proposed a model involving the repinning of the moving vortices. From this scenario, theoretical deduction leads to consistent results in this region.
74.25.Qt - Vortex lattices, flux pinning, flux creep.
74.25.Fy - Transport properties (electric and thermal conductivity, thermoelectric effects, etc.).
© EDP Sciences 2004