PHYSICAL CHARACTERISTICS OF IMAGINARY AC MAGNETIC-SUSCEPTIBILITY OF GRANULAR SUPERCONDUCTOR, HG0.69PB0.31BA2CA2CU3O8+DELTA

Temperature dependence of the imaginary part of ac magnetic susceptibi lity chi '' of Hg.69Pb.31Ba2Ca2 Cu3O8+delta is investigated. We trace out the hysteresis loops at different temperatures for the experimenta l data of Hg.69Pb.31Ba2Ca2Cu3O8+delta. Furthermore, the external ac fi eld has fully been penetrated into the specimen at the coupling temper ature T-p(real), which is predicted by our theory, but with a slight t emperature shift Delta T-p from T-p(expected) at which the magnetic fi eld have just penetrated into the centre of the specimen, i.e. T-p(rea l) > T-p(expected).