Berry Phase Coupling and the Cuprate Neutron Scattering Resonance

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We examine the influence of coupling between particle-hole and particle-particle spin fluctuations on the inelastic neutron scattering resonance (INSR) in cuprate superconductors in both weak and strong interaction limits. For weak-interactions in the particle-hole channel, we find that the interchannel coupling can eliminate the resonance. For strong interactions which drive the system close to a $\bm{Q}=(π,π)$ magnetic instablity, the resonance frequency always approaches zero but its value is influenced by the interchannel coupling. We comment on constraints imposed on cuprate physics by the INSR phenomenology, and a comparison between the cuprates and the newly-discovered iron pnictide superconductors is discussed.
5 pages, 1 figure

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Strongly Correlated Electrons, Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/229310

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0905.0464
 http://arxiv.org/abs/0905.0464

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arXiv