Josephson effects in unconventional heavy fermion superconductors
S. K. Yip, Y. S. Sun and J. A. Sauls
- Date: September 1996
Czech J Phys (1996) 46: 557-559
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 + i py)
Δ(E2u) ~ pz(px + i py)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.
Proceedings of the 21st International Conference on Low Temperature Physics,
Prague, August 8-14, 1996; 2 pages, 1 figure.