Europhys. Lett.
Volume 66, Number 2, April 2004
Page(s) 272 - 276
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 April 2004
Europhys. Lett., 66 (2) , pp. 272-276 (2004)
DOI: 10.1209/epl/i2003-10208-x

Anomalous pinning enhancement during the superconducting-normal transition of $\chem{2H}$- $\chem{NbSe_{2}}$

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

(Received 3 June 2003; accepted in final form 18 February 2004)

The magnetic-field dependence of the resistance ( R- H) of $\chem{2H}$- $\chem{NbSe_{2}}$ was carefully measured. Accompanied by the superconducting-normal (S-N) transition, a small resistance dip emerges near the upper critical field $H_{{\ab{c}}2}$. This anomaly was consolidated by that of the critical current, which presents a shoulder in the $I_{{\ab{c}}}$- 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.

74.25.Qt - Vortex lattices, flux pinning, flux creep.
74.25.Fy - Transport properties (electric and thermal conductivity, thermoelectric effects, etc.).

© EDP Sciences 2004