Magnetic Properties of Superconducting Pb-Bi System Alloy Filaments Produced by Glass-Coated Melt Spinning

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Abstract
The superconducting long filaments of Pb45Bi35 Sn20 and Pb45Bi40Te15 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, κ and T c of the filaments decreased as the result of room-temperature annealing. κ was estimated from the equation B c2=√2κB 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.