Abstract
The ac susceptibility of both 2223 single phase and 2212, 2223 multi-phase (Bi 1-x Pb x ) 2 Sr 2 Ca 2 Cu 3 O y superconductors in small ac magnetic field has been performed in terms of complex susceptibility X=X′-iX″. The real part X′ of the susceptibility spectra shows two types of characteristics for two kinds of samples: One contributed by intra-grain is insensitive to the amplitude h 0 (6mOe-12.00e) of the external ac field, and the other contributed by the inter-grain is sensitive to h 0 . In the latter case, the transitive width is remarkably broadened and there exists a corresponding X″ peak, the temperature of which shifts to lower temperature as h 0 increases. Differently, for the multi-phase sample, there exist two steps of transition and two corresponding X″ peaks which are sensitive to h 0 . The frequency dependence of the complex susceptibility has also been investigated, but there is no obvious frequency dependence.
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