INDUCTANCE PROBE EXAMINATION OF A SUPERCONDUCTING BI-PB-SR-CA-CU-O CERAMIC

The superconducting material with the nominal composition Bi1.6Pb0.4Sr2Ca2Cu3Ox has been synthesized and examined by the inductance probe method recently described by the authors [1]. The inductance data shows T(c) to be in the range 105 K -110 K, in good agreement with previously reported results [4]; the inductance falls steadily from about 200 K before the main superconducting transition is reached. The observed drop in inductance indicated that 25% of the volume of the material is superconducting, in contrast to the behavior of YBCO and Tl-Ba-Ca-Cu-O systems. Inductance-field measurements, at 77 K, below T(c) show that the lower critical field H(c1) = 17 gauss, and the upper critical field H(c2) = 4 T, in good agreement with published data [11].