We investigate the paramagnetic-metal-to-antiferromagnetic-metal and antiferromagnetic-metal-to-antiferromagnetic-insulator transitions using a slave-boson mean-field theory. To this effect, we discuss the ground state of the half-filled Hubbard model as a function of (Formula presented) and correlation strength U, where t and (Formula presented) are the hopping amplitudes between nearest and next-nearest neighbors, respectively. The metal-insulator transition at a critical (Formula presented) is of second order for small levels of magnetic frustration, (Formula presented) and of first order for large ones, (Formula presented) The insulator is always antiferromagnetically ordered, while the metal exhibits a second-order transition from a paramagnetic to an antiferromagnetic state up to (Formula presented) as U is increased. We also contrast these findings with what we obtain in Hartree-Fock approximation.
|Number of pages
|Physical Review B - Condensed Matter and Materials Physics
|Published - 2000
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics