We investigate the Mott transition in infinite dimensions in the orbitally degenerate Hubbard model. The qualitative features of the Mott transition found in the one-band model are also present in the orbitally degenerate case. We show that the quantitative aspects of the low-energy behavior near the Mott insulating state with one electron per site are not very sensitive to orbital degeneracy, justifying the quantitative success of the one-band model which had been previously applied to orbitally degenerate systems. We contrast this with quantities that have a sizable dependence on the orbital degeneracy and comment on the role of the intra-atomic exchange J. © 1996 The American Physical Society.

• Received 1 July 1996

DOI:https://doi.org/10.1103/PhysRevB.54.R14221