Abstract
The normal–superconductor transition of sintered YBCO samples was monitored by AC susceptibility measurements. Applying a supplementary (square-wave) magnetic field modulation, the in-phase susceptibility signal’s envelope presents a maximum. The temperature belonging to this maximum coincides with the characteristic zero-resistance temperature ( T c). This coincidence makes it possible for the method to be used not only for the correct determination of T c but also for the estimation of the fraction of the superconductive material to the rest, for a percolation path to start. The ∼0.5 percolation threshold found and the ∼0.05 bond occupation probability among planar clusters confirm that the superconductivity in our granular samples is a quasi-two-dimensional case.
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