Neutron resonance in high-Tc superconductors is not the π particle

O. Tchernyshyov, M. R. Norman, A. V. Chubukov

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We discuss the interplay of particle-particle and particle-hole spin-triplet channels in high-Tc superconductors using a quasiparticle dispersion motivated by angle-resolved photoemission. Within a generalized random-phase approximation, we find a well-defined antibound state of two holes, the π resonance of Demler and Zhang, as well as a bound state of a particle and a hole, the spin exciton. We show that the energy of the π resonance always exceeds 2Δ, twice the maximum d-wave gap, therefore the neutron resonance observed in the cuprates around energy Δ is most likely a spin exciton. At the same time, we speculate that the π particle can exist at higher energies and might be observed in neutron scattering around 100 meV.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
StatePublished - Mar 19 2001


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