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Non-Fermi-liquid behavior and double-exchange physics in orbital-selective Mott systems
S Biermann1, L de' Medici, A Georges
1Centre de Physique Théorique, Ecole Polytechnique, 91128 Palaiseau Cedex, France.
Physical Review Letters
|December 31, 2005
Summary
We explored an orbital-selective Mott phase where localized and itinerant electrons coexist. This phase, described by a generalized double-exchange model, exhibits unique high-temperature properties distinct from Fermi liquids.
Area of Science:
- Condensed matter physics
- Quantum mechanics
- Materials science
Background:
- The orbital-selective Mott phase involves electrons with differing localization properties.
- Understanding its high-temperature behavior is crucial for novel electronic materials.
Purpose of the Study:
- To analyze the low-energy physics of the orbital-selective Mott phase.
- To characterize the high-temperature disordered phase and its properties.
Main Methods:
- Study of a multiband Hubbard model.
- Derivation of a generalized double-exchange model for low-energy physics.
Main Results:
- The orbital-selective Mott phase is accurately described by a generalized double-exchange model.
- The high-temperature phase exhibits a finite scattering rate for conduction electrons at the Fermi level.
- This scattering rate shows continuous dependence on spin anisotropy.
Conclusions:
- The high-temperature disordered phase deviates from standard Fermi liquid theory.
- The generalized double-exchange model provides a valid framework for understanding this exotic phase.