Josephson effects in unconventional heavy fermion superconductors |
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Authors: | S K Yip Y S Sun J A Sauls |
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Institution: | 1.Department of Physics & Astronomy,Northwestern University,Evanston,USA |
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Abstract: | 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. |
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