Non-Fermi-Liquid Behavior and Double-Exchange Physics in Orbital-Selective Mott Systems

S. Biermann, L. de' Medici, A. Georges
2005 Physical Review Letters  
We study a multi-band Hubbard model in its orbital selective Mott phase, in which localized electrons in a narrow band coexist with itinerant electrons in a wide band. The low-energy physics of this phase is shown to be closely related to that of a generalized double-exchange model. The high-temperature disordered phase thus differs from a Fermi liquid, and displays a finite scattering rate of the conduction electrons at the Fermi level, which depends continuously on the spin anisotropy.
doi:10.1103/physrevlett.95.206401 pmid:16384076 fatcat:vj4rpcl74bdftn5j5t6wd3xyr4