The dependences of critical current on the temperature and magnetic field and the current-voltage characteristics in response to incident microwave radiation are measured in the direction of the c -axis of the 80 K superconducting phase (Bi, Pb) 2 Sr 2 CaCu 2 O y bulk single crystal. Josephson junctionlike behavior is successfully observed, and it shows that the single crystal itself is composed of Josephson junctions along the c -direction and that its electrical transport in this direction is limited by intrinsic tunnel barriers existing in the single crystal.
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Aoyama et al. (1992) studied this question.