Abstract
Using a LDA+GTB (local density approximation+generalized tight-binding) hybrid scheme we investigate the band structure of the electron-doped high-Tc materialSm2−xCexCuO4. Parameters of the minimal tight-binding model for this system (theso-called three-band Emery model) were obtained within the NMTO (Nth-order muffin-tin orbital) method. The doping evolution of the dispersion and the Fermisurface in the presence of electronic correlations was investigated in two regimes ofmagnetic order: short-range (spin-liquid) and long-range (antiferromagnetic metal). Eachregime is characterized by the specific topologies of the Fermi surfaces and we discuss theirrelation to recent experimental data.
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