Magnetism and Superconductivity in a Two-band Hubbard Model in Infinite Dimensions

Simple item page
dc.creatorOno, Y.
dc.creatorSano, K.
dc.date2003-04-28
dc.date.accessioned2026-07-25T22:37:20Z
dc.descriptionWe 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 charge-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.
dc.description3 pages, 5 figures, proceedings of the International Conference on Strongly Correlated Electrons with Orbital Degrees of Freedom (ORBITAL2001)
dc.identifierhttps://arxiv.org/abs/cond-mat/0304624
dc.identifierhttp://arxiv.org/abs/cond-mat/0304624
dc.identifierJ. Phys. Soc. Jpn. 71 (2002) Supplement 356-358
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/90875
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleMagnetism and Superconductivity in a Two-band Hubbard Model in Infinite Dimensions
dc.typetext

Files

Collections

Artificial intelligence