Anomalous pinning enhancement during the superconducting-normal transition of 2H-NbSe2

The magnetic-field dependence of the resistance (R-H) of 2H-NbSe2 was carefully measured. Accompanied by the superconducting-normal (S-N) transition, a small resistance dip emerges near the upper critical field H-c2. This anomaly was consolidated by that of the critical current, which presents a shoulder in the I-c-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.