Reversible magnetization of a strong-pinning superconductor

Abstract

Measurements of specific heat and magnetization have been made on the same sample of melt-processed Y-Ba-Cu-O (YBCO). Above the irreversibility line H is constant, and below the irreversibility line B is constant. The free energy and, hence, the reversible magnetization in both the irreversible and reversible region are calculated from the specific heat on this basis. The reversible magnetization and the penetration depth derived from this analysis broadly agree with d-wave theory if the field dependence of λ(0) is taken into account and is consistent with other experimental results. A peak in the specific heat at the irreversibility line is not due to the change from CB to CH, but is probably due to the entropy associated with the melting transition, although a contribution from the pinning centers cannot be excluded.

Source-reported materials — not catalogue approval

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