ORIGIN OF DISSIPATION IN HIGH-T(C) SUPERCONDUCTORS

Based on a systematic experimental study of the resistivity of high-qu ality single crystals of (La1-xSrx2CuO4, a phenomenological approach i s proposed in which the dissipation for the direction perpendicular to the superconducting layers is explained by thermal fluctuations of th e phase in Josephson junctions. By introducing an effective junction a rea A(H,T), an analytical expression for the resistivity is formulated , with which the c-axis resistivity as a function of T, H, and theta ( angle between H and the basal plane) can be very well explained.