Order parameter in superconductors with nondegenerate bands

I. A. Sergienko and S. H. Curnoe
Phys. Rev. B 70, 214510 – Published 7 December 2004

Abstract

In noncentrosymmetric metals, the spin degeneracy of the electronic bands is lifted by spin-orbit coupling. We consider general symmetry properties of the pairing function Δ(k) in noncentrosymmetric superconductors with spin-orbit coupling (NSC), including CePt3Si, UIr, and Cd2Re2O7. We find that Δ(k)=χ(k)t(k), where χ(k) is an even function which transforms according to the irreducible representations of the crystallographic point group and t(k) is a model-dependent phase factor. We consider tunneling between a NSC and a conventional superconductor. It is found that, in terms of thermodynamical properties as well as the Josephson effect, the state of NSC resembles a singlet superconducting state with gap function χ(k).

  • Received 8 June 2004

DOI:https://doi.org/10.1103/PhysRevB.70.214510

©2004 American Physical Society

Authors & Affiliations

I. A. Sergienko* and S. H. Curnoe

  • Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John’s, Newfoundland & Labrador A1B 3X7, Canada

  • *Present address: Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. Electronic address: sergienko@ornl.gov

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Issue

Vol. 70, Iss. 21 — 1 December 2004

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