The upper critical field of Pb doped Bi-Sr-Ca-Cu-O compounds
S H Han; M Andersson; S H Han; Department of Solid State Physics, The Royal Institute of Technology, S-100 44 Stockholm, Sweden; M Andersson; Department of Solid State Physics, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
Журнал:
Physica Scripta
Дата:
1991-07-01
Аннотация:
The upper critical field H<sub>c2</sub> of four Bi-(Pb)-Sr-Ca-Cu-O superconductors with the 110K phase has been measured as a function of temperature. H<sub>c2</sub> exhibited a (T<sub>c</sub> - T)<sup>α</sup> temperature dependence with α > 1 for two impure samples, but showed a linear temperature dependence for the purest sample, which is not expected according to current theories and other experiments.
187.1Кб