Magnetic properties of the three-band Hubbard model

We present magnetic properties of the three-band Hubbard model in the paraand 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 md ≈ 0.5 one can observe rich structures in the spectral-functions similar to the t-J model which can be related to the well known bound states for one hole in the Neélbackground. In addition to the one-particle properties we discuss the static spin-susceptiblity in the paramagnetic state at the points q = 0 and q = (π, π, π, · · ·) 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 and 75.10.-bGeneral theory and models of magnetic ordering