Abstract
The dc magnetization of a superconducting ${\mathrm{BaPb}}_{0.75}{\mathrm{Bi}}_{0.25}{\mathrm{O}}_{3}$ sample has been measured as a function of magnetic field and temperature. The results showed that an irreversibility line lies considerably below the superconducting normal phase transition boundary ${B}_{c2}(T),$ similar to that commonly observed in high-temperature superconductors, even though ${\mathrm{BaPb}}_{0.75}{\mathrm{Bi}}_{0.25}{\mathrm{O}}_{3}$ displays a very long coherence length. We attributed the observed large magnetically reversible region to a very small thermodynamic field, which leads to low condensation energies. The reversible magnetization data obtained in the region above the irreversibility line enable us to determine a full set of superconducting parameters for the material.
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