Electron spectrum and superconductivity in the t−J model at moderate doping
N. M. Plakida, V. S. Oudovenko
DOI 10.1103/PhysRevB.59.11949 · Physical Review B
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Abstract
A microscopical theory of electron spectrum and superconductivity within the two-dimensional t−J model in paramagnetic state is proposed. By employing the projection technique for the Green functions in terms of the Hubbard operators self-consistent Eliashberg equations are derived. A strong coupling of electrons with spin and charge fluctuations due to exchange and kinematical interactions is obtained. In the normal state, one-electron spectral functions reveal narrow quasiparticle peaks close to the Fermi surface (FS) with an additional broad incoherent band. The FS changes from holelike at low doping to electronlike for hole concentrations δ>0.3. In the superconducting state we observe d-wave pairing with the maximal Tc≃0.04t at optimal doping δ≃0.3.
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