Flux motion in Bi and Tl — based superconductors

✍ Scribed by D. Fiorani; A.M. Testa; J. Tejada

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 814 KB
• Volume: 1
• Category: Article
• ISSN: 0964-1807
• DOI: 10.1016/0964-1807(93)90400-v

✦ Synopsis

The time decay of the magnetization was studied on Tl -Ba -Ca -Cu -0 and Bi ( Pb ) -Sr -Ca -Cu -0 superconductors. In the Tl -based compound, the results provide evidence for a non thermally activated flux motion at low temperature suggesting quantum tunneling of vortices. In the Bi-based compound a crossover, with increasing temperature, from logarithmic to non logarithmic decay regime, is found according to the collective creep model.