The Resonance Peak in Sr${}_2$RuO${}_4$: Signature of Spin Triplet Pairing

Dirk K. Morr, Peter F. Trautman, Matthias J. Graf

We study the dynamical spin susceptibility, $\chi (\mathbf{q},\omega )$, in the normal and superconducting state of Sr${}_2$RuO${}_4$. In the normal state, we find a peak in the vicinity of ${\bf…