Magnetic resonance in the cuprates -- exciton, plasmon, or π-mode

Details Magnetic resonance in the cuprates -- exciton, plasmon, or π-mode Magnetic resonance in the cuprates -- exciton, plasmon, or π-mode

2008-12-14

arxiv.org/abs/0812.2697v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pp, 5 figures, submitted to PRB

Scientific paper

We re-analyzed the issue whether the resonance peak observed in neutron scattering experiments on the cuprates is an exciton, a \pi-resonance, or a magnetic plasmon. We considered a toy model with on-cite Hubbard U and nearest-neighbor interactions in both charge and spin channels. We found that the resonance is predominantly an exciton, even if magnetic interaction is absent and d-wave pairing originates from attractive density-density interaction. Our results indicate that one cannot distinguish between spin and charge-mediated pairing interactions by just looking at the resonance peak in the dynamic spin susceptibility.

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