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Resonance Peak in Sr2RuO4: Signature of Spin Triplet Pairing

# Resonance Peak in Sr2RuO4: Signature of Spin Triplet Pairing,10.1103/PhysRevLett.86.5978,Physical Review Letters,Dirk K. Morr,Peter F. Trautman,Matthi

Resonance Peak in Sr2RuO4: Signature of Spin Triplet Pairing
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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.
Journal: Physical Review Letters - PHYS REV LETT , vol. 86, no. 26, pp. 5978-5981, 2001
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