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Superconducting transition in ruthenocuprate RuSr2GdCu2O8 viewed from the studies of the imaginary part of ac susceptibility

We have measured two structurally similar superconducting systems RuSr2GdCu2O8 and GdBa2Cu3O7 by means of high resolution AC susceptibility. Real and imaginary part of AC susceptibility of both bulk-ceramic and powdered samples has been studied down to the very small magnetic field levels. We show that there are significant differences in the evolution of superconductivity in the two studied superconducting systems. In particular, we show that the superconducting transition in the grains in RuSr2GdCu2O8 system is masked with intrinsic magnetism of complex origin.

other cuprates; magnetic properties; proximity effects; weak links; tunneling phenomena; Josephson effects

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