TY - JOUR
T1 - Neutron resonance in high-Tc superconductors is not the π particle
AU - Tchernyshyov, O.
AU - Norman, M. R.
AU - Chubukov, A. V.
PY - 2001/3/19
Y1 - 2001/3/19
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.63.144507
DO - 10.1103/PhysRevB.63.144507
M3 - Article
AN - SCOPUS:0034899942
SN - 1098-0121
VL - 63
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 14
ER -