Comparative study of electron- and hole-doped high-Tc compounds in pseudogap regime: LDA plus DMFT+Σk approach

Pseudogap regime for the prototype high-T-c compounds hole-doped Bi2Sr2CaCu2O8-x (Bi2212) and electron-doped Nd2-xCexCuO4 (NCCO) is described by means of novel generalized LDA+DMFT+Sigma(k) approach. Here, conventional dynamical mean-field theory (DMFT) equations are supplied with additional (momentum dependent) self-energy Sigma(k). In the present case, Sigma(k) describes nonlocal dynamical correlations induced by short-ranged collective Heisenberg-like antiferromagnetic spin fluctuations. Material-specific model parameters of two neighboring CuO2 layers of Bi2212 and single CuO2 layer of NCCO were obtained within local density approximation (LDA) and constrained LDA method. We show that Fermi surface in presence of the pseudogap fluctuations have perfectly visible hot-spots for NCCO, while in Bi2212 there is just a rather broad region with strong antiferromagnetic scattering. Results obtained are in good agreement with recent ARPES and optical experiments. (C) 2008 Elsevier Ltd. All rights reserved.