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A.C. complex susceptibility χ'-i χ'' was measured as a function of temperature at various field amplitude for the sintered Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O in order to investigate the coupling properties of both polycrystalline compounds. The steps in χ'-T curves and the peaks in χ''-T curves were composed of two contributions for sintered bulk samples. One comes from the intergrain couplings, while the other is attributed to the bulk superconductivity. The amplitude dependence of the former contribution indicates that the coupling in the Bi compound is weaker than that in the Tl compound.
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Kumakura et al. (1988) studied this question.
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