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

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

2000-10-04

arxiv.org/abs/cond-mat/0010067v2

Phys. Rev. Lett. 86, 5978 (2001)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, final version

Scientific paper

10.1103/PhysRevLett.86.5978

We study the dynamical spin susceptibility, $\chi({\bf q}, \omega)$, in the normal and superconducting state of Sr$_2$RuO$_4$. In the normal state, we find a peak in the vicinity of ${\bf Q}_i\simeq (0.72\pi,0.72\pi)$ 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 $\chi$, but is absent in the in-plane component. In contrast, no resonance peak is expected for spin singlet pairing.

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