Abstract
Elastic modulus softening and a corresponding internal friction peak occur at 110 K in 2223 single-phase samples of Bi(Pb)-Sr-Ca-Cu-O superconductor prepared by the sol-gel method. The sudden change in internal friction has the characteristics of a structural transition. There is a clear, anomalous peak with Delta Cp=1.8 mJ g-1 K-1 in the specific heat versus temperature curve, corresponding to a superconducting transition. This indicates that some kind of structural readjustment occurs before the superconducting transition.
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