Abstract
Bulk samples of lead (Pb)–indium (In) alloys, Pb 100− x In x ( x8.23, 4.0 and 2.0 wt.%) were prepared and were annealed at a temperature near the melting temperature every 10 days from 10 to 50 days. The lattice constant of each alloy approaches an equilibrium value with increasing in the annealing time t a and decreases with increasing In concentration. Isothermal magnetization ( M)–external magnetic field ( H) characteristics in the mixed state have not shown the change from irreversible curve to reversible one, which is one of the evidences for appearance of the vortex liquid. The upper critical field and the superconducting transition temperature T c increased with increasing In concentration. The correlative change between the superconducting coherence length at 0 K and t a could not be observed.
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