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Magnetic resonance in the cuprates -- exciton, plasmon, or \pi-mode

Research paper by Zhihao Hao, Andrey V. Chubukov

Indexed on: 14 Dec '08Published on: 14 Dec '08Published in: Physics - Strongly Correlated Electrons



Abstract

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.