Abstract

The quasiclassical theory has been applied to study the Josephson junction consisting of mixed s + d-wave superconductors. The order parameter and critical current are calculated selfconsistently for various d-wave ratio v d 2 and relative crystal orientation angle θ of the two superconductors. It is found that both the magnitude and the form of critical current depend sensitively on v d 2 and θ. For v d 2 > 0.63, there always exists an angle θ where the current-phase relation I( fgf) has a period of π instead of 2π in conventional s-wave superconductors. Our result can be used to determine whether the high T c superconductor is a pure d-wave or mixed s + d-wave superconductor.

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