EXPERIMENTAL STUDY ON THE MAGNETIC PENETRATION INTO Y-Ba-Cu-O SUPERCONDUCTORS

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Abstract
Recently there have been several reports on the behaviour of granular superconductivity in high-Tc Y-Ba-Cu-O system. In granular superconductors, superconducting grains are weakly coupled to one another by the proximity Josephson effects. When an external field is applied, screening currents will develop in a region of the order of the effective penetration depth, which might be much greater than London penetration depth[1]. Using the Schawlow low-frequency method, the temperature, field and time dependences of the penetration depth in Y-Ba-Cu-O superconductors were studied. In this paper we present our results. which show the oxides have many of the features expected for a granular superconductor.

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