Czechoslovak Journal of Physics

, Volume 46, Supplement 2, pp 557–558 | Cite as

Josephson effects in unconventional heavy fermion superconductors

  • S. K. Yip
  • Y. S. Sun
  • J. A. Sauls
LTSC—Theory

Abstract

We discuss the Josephson effect for pairing states which break crystal symmetries in addition to gauge symmetry. We consider theE1g andE2u models for the low-temperature phase ofUPt3, 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.

References

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    J. A. Sauls, Adv. Phys. 43, 113 (1994).CrossRefADSGoogle Scholar
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    S. K. Yip, Y. S. Sun and J. A. Sauls, Physica B 194–196, 1969 (1994).CrossRefGoogle Scholar
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    A. J. Millis D. Rainer and J. A. Sauls, Phys. Rev. B 38, 4504 (1988); J. A. Sauls, Z. Zou, and P. W. Anderson, unpublished (1985).CrossRefADSGoogle Scholar
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    Higher order tunneling processes lead to a finite current for σ=π/2, and σ-0;c.f. S. K. Yip, J. Low Temp. Phys. 91, 1203 (1993).CrossRefGoogle Scholar

Copyright information

© Institute of Physics, Acad. Sci. CR 1996

Authors and Affiliations

  • S. K. Yip
    • 1
  • Y. S. Sun
    • 1
  • J. A. Sauls
    • 1
  1. 1.Department of Physics & AstronomyNorthwestern UniversityEvanstonUSA

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