Abstract
Dynamical spin susceptibilities in the chiral p -wave superconducting state, the most probable pairing state in Sr 2 RuO 4 , are calculated taking proper account of contributions from collective excitations. It is found that a spin wave mode appears in dynamical transverse susceptibility. The spin wave mode is gapped by spin–orbit interaction, but its frequency in the long wavelength limit can remain at the order of gap frequency when the anisotropy caused by spin–orbit interaction is small. The observability of the spin wave mode in a neutron scattering experiment is discussed.
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