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

Dirk K. Morr·Peter F. Trautman·Matthias J. Graf
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Abstract

We study the dynamical spin susceptibility, $χ({\bf q}, ω)$, in the normal and superconducting state of Sr$_2$RuO$_4$. In the normal state, we find a peak in the vicinity of ${\bf Q}_i\simeq (0.72π,0.72π)$ in agreement with recent inelastic neutron scattering (INS) experiments. We predict that for spin triplet pairing in the superconducting state a {\it resonance peak} appears in the out-of-plane component of $χ$, but is absent in the in-plane component. In contrast, no resonance peak is expected for spin singlet pairing.

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Dirk K. Morr, Peter F. Trautman, Matthias J. Graf. 2001-06-20. The Resonance Peak in Sr$_2$RuO$_4$: Signature of Spin Triplet Pairing. https://doi.org/10.1103/physrevlett.86.5978

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