Abstract
We report a metastable field-cooled magnetization ( M fc) in Y doped Bi(2212) superconductors ( T c1=86 K) containing an intergranular phase with T c2=68 K. As the sample was field-cooled through 68 K, M fc has contribution from two moments of opposite sign: a negative one arising from the intragranular phase and a positive one arising from the intergranular phase, the latter being cooling rate dependent. At faster cooling rates, the positive moment dominates and M fc >0 for H<10 Oe. We have also observed equality of the magnetic remanent moment ( M rem) and the difference of M fc and zero-field-cooled magnetization ( M zfc) in the system.
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