Josephson effects in unconventional heavy fermion superconductors
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We discuss the Josephson effect for pairing states which break crystal symmetries in addition to gauge symmetry. We consider theE 1g andE 2u models for the low-temperature phase ofUPt 3, with order parameters Δ(E 1g )∼p z (p x +ip y ) and Δ(E 2u )∼p z (p x +ip y )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.
KeywordsCritical Current Tunnel Junction Josephson Current Orbital Symmetry Unconventional Superconductor