Superconducting transition in ruthenocuprate viewed from the studies of the imaginary part of ac susceptibility
Institute of Physics - Bijenicka c.46, POB
304, HR-10000 Zagreb, Croatia
2 Institute of Physics of Complex Matter, FSB, EPFL - CH-1015 Lausanne, Switzerland
Accepted: 2 October 2002
We have measured two structurally similar superconducting systems, and by means of high-resolution ac susceptibility. The real and the imaginary part of ac susceptibility of both bulk-ceramic and powdered samples have 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 system is masked with intrinsic magnetism of complex origin.
PACS: 74.72.Jt – Other cuprates / 74.25.Ha – Magnetic properties / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects
© EDP Sciences, 2002