ISSN:
1089-7550
Quelle:
AIP Digital Archive
Thema:
Physik
Notizen:
ac magnetic susceptibility measurements is one of the processes by which the superconducting properties of mixed oxide superconductors can be characterized. The study of the superconductors at an externally applied magnetic field predicts the existence of two superconducting transitions due to: (i) the one reflecting the intragrain properties and (ii) the other describing intergrain interactions which might be assumed as due to Josephson tunneling. In this abstract, we report our work on the ac susceptibility measurements in PbxBi2−xSr2Ca2Cu3O10 superconductors to study the real part of χ' as a function of temperature, Pb concentration, and sintering time. The results have been compared with the x-ray diffraction (XRD) results. The material preparation and the characterization techniques used would be discussed. The XRD and the susceptibility measurements indicate that too high Pb concentrations and too low sintering time does not seem to improve the high Tc phase. The weak link coupling phase determined from the χ'-T dependence is strongly dependent on both the Pb concentration and the sintering time. The transition temperature for the low Tc phase decreases with sintering time and increases with the increasing Pb concentration. The results would be discussed in the light of the best superconducting properties achieved by variation of the material preparation.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1063/1.356862
Permalink
