Abstract
We calculate self-consistently the quasiparticle energy together with the RPA spin and charge susceptibilities for the 2D Hubbard model with additional electron-phonon interaction. In the normal state the spectral densities of the spin and charge susceptibilities scale with ω/ T for small ω and saturate for ω≳4 T. In the superconducting state these spectra acquire a gap. These results are in fair agreement with neutron scattering and thermal conductivity measurements on YBa 2Cu 3O 7−δ. The calculated photoemission spectrum of the superconducting state exhibits a narrow quasiparticle peak and a pronounced minimum between this peak and the broad band at lower energies.This minimum decreases as the temperature is decreased with measurements on Bi 2Sr 2CaCu 2O 8.
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