Atoms, ions, and molecules crystal field theory Mott transition and Hubbard model Mott insulators Heisenberg magnets itinerant electron magnetism ferromagnetism in Hubbard models the Gutzwiller… Expand

We review experimental data on the low-temperature behaviour of pure, and cation-doped 1T-TaS2, This suggests that the transition into the commensurate phase is accompanied by Mott-localization while… Expand

The Josephson phase model with charging energies is studied in the Oguchi pair approximation. Allowing for the short-range fluctuations of the phase eliminates the reentrant feature predicted by some… Expand

We examine Pr3+ crystal field models with near-degeneracy of the two lowest crystal field levels, where interaction-induced quadrupolar and dipolar moments are as important as the permanent moments… Expand

The metal-insulator transition (MIT) of BaVS3 is suppressed under pressure and above the critical pressure of p~2GPa the metallic phase is stabilized. We present the results of detailed… Expand

A variational wave function is constructed and studied for the spin-compensated Fermi-liquid-type ground state in the Kondo lattice model. The spins of the localized f-electrons are compensated by… Expand