title: Spin freezing transition and non-Fermi-liquid self-energy in a three-orbital model.
abstract: A single-site dynamical mean-field study of a three band model with the rotationally invariant interactions appropriate to the t_(2g) levels of a transition metal oxide reveals a quantum phase transition between a paramagnetic metallic phase and an incoherent metallic phase with frozen moments. The Mott transitions occurring at electron densities n=2, 3 per site take place inside the frozen moment phase. The critical line separating the two phases is characterized by a self-energy with the frequency dependence Sigma(omega) approximately sqrt[omega] and a broad quantum critical regime. The findings are discussed in the context of the power law observed in the optical conductivity of SrRuO3.
authors.affiliation: Columbia University, 538 West 120th Street, New York, NY 10027, USA.
authors.forename: Philipp
authors.initials: P
authors.lastname: Werner
authors.forename: Emanuel
authors.initials: E
authors.lastname: Gull
authors.forename: Matthias
authors.initials: M
authors.lastname: Troyer
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Millis