We discuss the Josephson effect for pairing states which break crystal symmetries in addition to gauge symmetry. We consider the E1g and E2u models for the low-temperature phase of UPt3, with order parameters Δ(E1g) ~ pz(px + ipy) and Δ(E2u) ~ pz(px + ipy)2. We report calculations of Josephson critical currents, taking into account the effects of depairing at the interface. For singlet-triplet junctions the critical current is non-zero only for spin-orbit, spin-flip tunneling, and is found to be much smaller than the Ambegaokar-Baratoff value even when the spin-orbit tunneling amplitude is comparable to the spin-independent amplitude.
ASJC Scopus subject areas
- Physics and Astronomy(all)