Abstract
Basic properties of the Jospephson effect in an s-wave superconductor/ Insulator/ d x 2 − y 2 -wave superconductor ( s/I/d) junction and a d x 2 − y 2 -wave superconductor/Insulator/ d x 2 − y 2 -wave superconductor ( d/I/d) junction are clarified for various crystal orientations. In both junctions, the phase difference ϑ dependence of the supercurrent does not always exhibit the usual sinusoidal behaviour. In general the minimum Free energy occurs neither at ϑ = 0 or ϑ = π. Zero-energy bound states of quasiparticles which are formed at zero energy can induce anomalous temperature dependence of maximum supercurrent in some d/I/d junctions.
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