Selection Rule in Josephson Coupling between In and Sr2RuO4

Details Selection Rule in Josephson Coupling between In and Sr2RuO4 Selection Rule in Josephson Coupling between In and Sr2RuO4

1999-09-14

arxiv.org/abs/cond-mat/9909214v1

Physics

Condensed Matter

Superconductivity

4 pages + 4 figures

Scientific paper

We have studied the Josephson coupling between a conventional s-wave superconductor (In) and Sr2RuO4 and found that the coupling is allowed in the in-plane direction, but not along the c axis. This selection rule indicates that the symmetry of superconducting order parameter of Sr2RuO4 is either p- or alternatively, purely d-wave. If Sr2RuO4 is a p-wave superconductor, as strongly favored by other experimental evidence, our result suggests that the pairing state of Sr2RuO4 is Gamma5 with d(k) = z(kx +/- iky), a nodeless state in which the spins of the superconducting electrons lie in the RuO2 planes.

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