Magnetic Properties of Superconducting Pb-Bi system Alloy Filaments Produced by GLass-Coated Melt Spinning

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The superconducting long filaments of Pb_<45>Bi_<35> Sn_<20> and Pb_<45>Bi_<40>Te_<15> alloys with a high T_c of 10.1 and 10.2 K, respectively, were produced by glass-coated melt spinning. Magnetic measurements of the filaments were made in the temperature range from 2.1 K to the zero field transition temperature. The magnetic properties of both filaments exhibited similar behavior. The magnetic hysteresis and trapped flux of the filaments are small due to the thin sample size (such as 20 μm in diameter) and became much smaller through room-temperature annealing. Moreover, the B_<c2>, κand T_c of the filaments decreased as the result of room- temperature annealing. κwas estimated from the equation B_<c2>=√<2>κB_c, where B__<c2> and B_c are the upper critical field and the thermodynamic critical field, respectively. The B_<c2> of filaments at various temperatures followed the de Gennes and Maki prediction for a dirty type-II superconductor.
社団法人応用物理学会の論文
1988-02-20