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

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...

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Bibliographic Details
Published inPhysical review letters Vol. 101; no. 16; p. 166405
Main Authors Werner, Philipp, Gull, Emanuel, Troyer, Matthias, Millis, Andrew J
Format Journal Article
LanguageEnglish
Published United States 17.10.2008
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Summary: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.
ISSN:0031-9007
DOI:10.1103/physrevlett.101.166405