Lower critical field and magnetization of strong-coupling, type II superconductors in the dirty limit

✍ Scribed by J. Rammer

• Publisher: Springer US
• Year: 1988
• Tongue: English
• Weight: 744 KB
• Volume: 71
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00116866

✦ Synopsis

Usadel's dirty-limit version of the Gorkov-Eilenberger theory including strongcoupling effects is used to calculate the lower critical field of superconducting alloys. The results of the (rigorous) numerical study, which is valid for all temperatures and Ginzburg-Landau parameters K, are compared with experiments and with the existing weak-coupling theory. One achieves agreement with the bulk of the experimental results only if K is properly adjusted. In addition, it is shown that a circular-cell approximation for the vortex state yields highly accurate magnetization curves, which are influenced in a characteristic way by strong electron-phonon coupling.