Abstract
We study DC magnetization of Bi-2212 single crystals and Bi-2223 polycrystalline pellets before and after intercalation with metal-phthalocyanines. Disruption of the interblock coupling due to the insertion of insulating ZnPc molecules between the unit cell blocks brings about a sharp decrease of irreversibility temperature T irr (in units of T irr/ T c) in the 2212 system, while T irr in the 2223 system is only moderately affected. This finding indicates that the interblock coupling is less significant for the flux pinning properties in the 2223 as compared to the 2212 system, probably due to a larger number of Cu-O layers contained within the unit cell block. On the other hand, similar experiment with NiPc has shown that the introduction of magnetic ions between the double Bi-O layers may be an efficient way to improve the flux pinning properties.
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