Probing Pairing Symmetry in Sr${}_2$RuO${}_4$

Abstract

We study the spin dynamics in a p-wave superconductor at the nesting vector associated with $\alpha$ and $\beta$ bands in Sr${}_2$RuO${}_4$. We find a collective mode at the nesting vector in the superconducting phase identified as the odd-parity pairing state which breaks time reversal symmetry. This mode in the spin channel only exists in the p-wave superconductor, not in s- or d-wave superconductors. We propose that probing this mode would clarify the pairing symmetry in Sr${}_2$RuO${}_4$. The possibility of second superconducting phase transition is also discussed.

5 pages, RevTex

Cited by in corpus (5)

• The Resonance Peak in Sr${}_2$RuO${}_4$: Signature of Spin Triplet Pairing
• Spin Density Wave Fluctuations and p-wave Pairing in Sr2RuO4
• Multi-orbital nature of the spin fluctuations in Sr${}_2$RuO${}_4$
• Absence of a large superconductivity-induced gap in magnetic fluctuations of Sr2RuO4
• Coherence peak in the spin susceptibility from nesting in spin-triplet superconductors; A probe for line nodes in Sr${}_2$RuO${}_4$