Critical Current of the Spin-Triplet Superconducting Phase in Sr2RuO4

There have been two different proposals for the spin-triplet order parameter of the superconducting phase in Sr2RuO4; an f-wave order parameter and the multigap model where some of the bands have the line node. In an effort to propose an experiment that can distinguish two cases, we study the behavior of the supercurrent and compute the critical current for these order parameters when the sample is a thin film with the thickness d ≪  where  is the coherence length. It is found that the supercurrent behaves very differently in two models. This will serve as a sharp test for the identification of the correct order parameter.

Hae-Young Kee1, Yong Baek Kim1, and K. Maki2
1Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
2Department of Physics, University of Southern California, Los Angeles, CA 90089