Two-Step Superconducting Transition of a Bi-Sr-Ca-Cu-O System

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Abstract
The ac susceptibility χ=χ'-i χ'' was used for examining the superconducting nature of a two-step transition in a Bi-Sr-Ca-Cu-O specimen. The X-ray diffraction pattern indicates that the crystalline habit of our specimen is tetragonal (a=3.81 Å, c=30.7 Å). Although both bulk and weakly coupled components appeared in the lower-T c phase of the sintered pellet, the latter phase was fully depressed by pulverization. The pulverization remarkably altered the transition profile of the higher-T c phase. The implications of these results are discussed.

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