Strongly Correlated Superconductivity and Pseudogap Phase near a multi-band Mott Insulator

Details Strongly Correlated Superconductivity and Pseudogap Phase near a multi-band Mott Insulator Strongly Correlated Superconductivity and Pseudogap Phase near a multi-band Mott Insulator

2004-01-07

arxiv.org/abs/cond-mat/0401090v2

Phys. Rev. Lett. 93, 047001 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.93.047001

Near a Mott transition, strong electron correlations may enhance Cooper pairing. This is demonstrated in the Dynamical Mean Field Theory solution of a twofold-orbital degenerate Hubbard model with inverted Hund's rules on-site exchange, which favors local spin-singlet configurations. Close to the Mott insulator, which is a local version of a valence bond insulator, a pseudogap non-Fermi-liquid metal, a superconductor, and a normal metal appear, in striking similarity with the physics of the cuprates. The strongly correlated superconducting state has a larger Drude weight than the corresponding normal state. The role of the impurity Kondo problem is underscored.

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