Itinerant ferromagnetism of the multiband Hubbard model

✍ Scribed by Takashi Yanagisawa; Yukihiro Shimoi

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 140 KB
• Volume: 194-196
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)90494-4

✦ Synopsis

We present some exact studies on the ferromagnetic ground state of the multiband Hubbard models including the periodic Anderson model (two-band) and CuO2 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+I 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 highspin state, indicating that a conduction electron is moving in the ferromagnetic background of localized spins. number of electrons and N is the number of sites.