Hysteresis Effects in the Superconducting Pb–In Alloy System

A method is presented for transforming hysteretic magnetization curves into their corresponding reversible magnetization curves. This procedure permits the determination of the thermodynamic critical field Hc; the lower critical field Hc1; the upper critical field Hc2; and the Ginzburg-Landau parameters κ1 and κ2, which are found to be equal for each corrected magnetization curve for samples containing up to 28 at.% In. Large, composition-dependent, hysteresis effects are noted in the magnetization curves of these Pb–In samples.