@article{oai:niigata-u.repo.nii.ac.jp:00002134, author = {Ono, Yoshiaki and Sano, Kazuhiro}, issue = {Supplement}, journal = {Journal of the Physical Society of Japan, Journal of the Physical Society of Japan}, month = {Dec}, note = {We study a two-band Hubbard model using the dynamical mean-field theory combined with the exact diagonalization method. At the electron density n = 2, a transition from a band-insulator to a correlated semimetal occurs when the on-site Coulomb interaction U is varied for a fixed value of the harge-transfer energy Δ. At low temperature, the correlated semimetal shows ferromagnetism or superconductivity. With increasing doping | n -2|, the ferromagnetic transition temperature rapidly decreases and finally becomes zero at a critical value of n. The second-order phase transition occurs at high temperature, while a phase separation of ferromagnetic and paramagnetic states takes place at low temperature. The superconducting transition temperature gradually decreases and finally becomes zero near n = 1 (n = 3) where the system is Mott insulator which shows antiferromagnetism at low temperature., Proceedings of the International Conference on Strongly Correlated Electrons with Orbital Degrees of Freedom (ORBITAL2001)}, pages = {356--358}, title = {Magnetism and Superconductivity in a Two-band Hubbard Model in Infinite Dimensions}, volume = {71}, year = {2002} }