Local properties and density of states in the two-dimensional p−d model of high-Tc superconductors

V. Fiorentino; F. Mancini; E. Ža̧sinas; A. F. Barabanov

doi:10.1103/PhysRevB.64.214515

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Local properties and density of states in the two-dimensional p−d model of high-Tc superconductors

V. Fiorentino, F. Mancini, E. Ža̧sinas, A. F. Barabanov

DOI 10.1103/PhysRevB.64.214515 · Physical Review B

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Abstract

The p−d model which well describes the CuO2 planes of the high-Tc superconductors is studied by means of the composite operator method. The relevant quasiparticle excitations are represented by composite operators. As a result of taking into account spin excitations we find a p-like band near the Fermi level. The dispersion of this band gives a Fermi surface which is in good agreement with the experimental measurements. Due to the strong mixing of the relevant excitations, the spectral weight of this band is reduced and gives a large Fermi surface in the moderately doped region. The dependence of the calculated physical quantities on model parameters, temperature and doping, is in very good agreement with the available quantum Monte Carlo results.