In this second part of a series of three publications on the magnetization of low-x superconductors, we present experimental and theoretical results on the lower critical field Hcl. We concentrate on highly pure niobium and vanadium samples. Both materials are type-II superconductors with a first or
Magnetization of low-κ superconductors I the phase transition at Hc1
✍ Scribed by H.W. Weber; E. Seidl; M. Botlo; C. Laa; E. Mayerhofer; F.M. Sauerzopf; R.M. Schalk; H.P. Wiesinger; J. Rammer
- Book ID
- 108024292
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 996 KB
- Volume
- 161
- Category
- Article
- ISSN
- 0921-4534
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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 magnetic properties of small-K superconducting In-Bi, In-Tl, In-Pb, Sn-Bi, and Sn-Sb alloys are investigated. The evaluation of the experiments is carried out in the framework of BCS and GLAG theory. At a critical alloy concentration a phase transition occurs, at which type I superconductivity g