Mott transitions in correlated electron systems with orbital degrees of freedom

Details Mott transitions in correlated electron systems with orbital degrees of freedom Mott transitions in correlated electron systems with orbital degrees of freedom

2002-06-26

arxiv.org/abs/cond-mat/0206508v2

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.67.035119

Mott metal-insulator transitions in an M-fold orbitally degenerate Hubbard model are studied by means of a generalization of the linearized dynamical mean-field theory. The method allows for an efficient and reliable determination of the critical interaction U_c for any integer filling n and different M at zero temperature. For half-filling a linear dependence of U_c on M is found. Inclusion of the (full) Hund's rule exchange J results in a strong reduction of U_c. The transition turns out to change qualitatively from continuous for J=0 to discontinuous for any finite J.

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