Advertisement

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 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.

Keywords

Critical Current Tunnel Junction Josephson Current Orbital Symmetry Unconventional Superconductor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. [1]
    J. A. Sauls, Adv. Phys. 43, 113 (1994).CrossRefADSGoogle Scholar
  2. [2]
    S. K. Yip, Y. S. Sun and J. A. Sauls, Physica B 194–196, 1969 (1994).CrossRefGoogle Scholar
  3. [3]
    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 B 38, 4504 (1988); J. A. Sauls, Z. Zou, and P. W. Anderson, unpublished (1985).CrossRefADSGoogle Scholar
  4. [4]
    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

Personalised recommendations