Orbital-Selective Mott transition out of band degeneracy lifting

Details Orbital-Selective Mott transition out of band degeneracy lifting Orbital-Selective Mott transition out of band degeneracy lifting

2008-08-09

arxiv.org/abs/0808.1326v2

Phys. Rev. Lett. 102,126401 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

Published version

Scientific paper

10.1103/PhysRevLett.102.126401

We outline a general mechanism for Orbital-selective Mott transition (OSMT), the coexistence of both itinerant and localized conduction electrons, and show how it can take place in a wide range of realistic situations, even for bands of identical width and correlation, provided a crystal field splits the energy levels in manifolds with different degeneracies and the exchange coupling is large enough to reduce orbital fluctuations. The mechanism relies on the different kinetic energy in manifolds with different degeneracy. This phase has Curie-Weiss susceptibility and non Fermi-liquid behavior, which disappear at a critical doping, all of which is reminiscent of the physics of the pnictides.

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