  To clarify the origin of anomalous behaviors in Pb/Sr2RuO4/Pb junctions in
terms of the pairing symmetry, a theory of the d.c. Josephson current in s-wave
superconductor / p-wave superconductor / s-wave superconductor junctions is
developed. Calculated results on the temperature dependence of the critical
Josephson current exhibit non-monotonous behaviors when the thickness of the
p-wave superconductor is comparable to the coherence length. The consistency
between present results with recent experimental measurement supports the
possibility of a unitary p-wave pairing state in Sr2RuO4.

Superconductivity