Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model

Details Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model

2008-06-16

arxiv.org/abs/0806.2621v2

Phys. Rev. Lett. 101, 166405 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.101.166405

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)\sim \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 SrRuO_3.

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