Probing Pairing Symmetry in Sr2RuO4
Hae-Young Kee
Abstract
We study the spin dynamics in a p-wave superconductor at the nesting vector associated with α and β bands in Sr2RuO4. 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 Sr2RuO4. The possibility of second superconducting phase transition is also discussed.
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