Abstract
The dc Josephson current and its fluctuations in superconductor/dirty normal metal/superconductor junctions are studied numerically by using the recursive Green function method, where a d-wave pairing symmetry is assumed in superconductors as it is in high- T c materials. The Josephson current is sensitive to the orientation angle ( α) between the crystalline axis of the high- T c superconductors and the normal of the junction interface. When the orientation angle is π/4, the fluctuations of the Josephson current become larger than those with α=0 because of the zero-energy state formed at junction interfaces.
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