Magnetic properties of the three-band Hubbard model
Institut für Theoretische Physik I, Universität
Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany
Accepted: 14 September 1998
Published online: 15 February 1999
We present magnetic properties of the three-band Hubbard model in the para and antiferromagnetic phase on a hypercubic lattice calculated with the Dynamical Mean-Field Theory (DMFT). To allow for solutions with broken spin-symmetry we extended the approach to lattices with AB-like structure. Above a critical sublattice magnetization one can observe rich structures in the spectral-functions similar to the model which can be related to the well known bound states for one hole in the Neél-background. In addition to the one-particle properties we discuss the static spin-susceptibility in the paramagnetic state at the points and for different dopings δ. The δ-T-phase-diagram exhibits an enhanced stability of the antiferromagnetic state for electron-doped systems in comparison to hole-doped. This asymmetry in the phase diagram is in qualitative agreement with experiments for high-Tc materials.
PACS: 71.27.+a – Strongly correlated electron systems / 71.30.+h – Metal-insulator transitions and other electronic transitions / 75.10.-b – General theory and models of magnetic ordering
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999