Abstract
We present some exact studies on the ferromagnetic ground state of the multiband Hubbard models including the periodic Anderson model (two-band) and CuO 2 plane in the oxide superconductors (three band). First we show rigorous arguments that the ground state of the periodic Anderson model contains a ferromagnetic phase with spin angular momentum S=(N−1)/2 for Ne=N+1 where N is the number of lattice sites and Ne is that of electrons. Secondly the exact diagonalization technique is applied to small clusters. The models have the phase with high-spin state, indicating that a conduction electron is moving in the ferromagnetic background of localized spins.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
