Intrinsic Josephson effects in various layered superconductors

Abstract

The coherence lenghts of some layered superconductors are comparable to or smaller that the interlayer distance, i.e. the layered crystal structure is mapped to a periodic order parameter modulation. In our measurements on (Bi 1−xPb x) 2Sr 2CaCu 2O 8+ϑ, IBi 2Sr 2CaCu 2O 8, Tl 2Ba 2Ca 2Cu 3O 10, Pr 2−xCe xCuO 4 +ϑ and κ-(BEDT-TTF) 2 Cu(NCS) 2 single crystals with transport perpendicular to the layers, we were able to detect the DC as well as the AC Josephson effects.