Investigation of the phase transition at Hc1 in low-K superconductors

✍ Scribed by H.W. Weber; E. Seidl; F.M. Sauerzopf; M. Botlo; C. Laa; E. Mayerhofer; H.P. Wiesinger; J. Rammer

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 127 KB
• Volume: 162-164
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(89)91075-7

✦ Synopsis

Several low-~ superconductors (Nb, Ta, V, LaAI2) were doped with small amounts of impurities in order to vary the Ginzburg-Landau parameter near its crltical value K = 1/42.

The corresponding magnetization curves show type-I, type-II/1 and type-II/2 behavior depending on the magnitude of t at T o. The experlmental results demonstrate that the phase boundaries separating the different types of phase transitions in the t-x plane are material independent, in remarkable contrast to theoretical results based on weak-coupling calculations. The anisotroplc strong-coupllng theory on the other hand agrees well with the bulk of the data.