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

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arxiv cond-mat/0401090 v2 pith:JQKIPAEX submitted 2004-01-07 cond-mat.str-el cond-mat.supr-con

classification cond-mat.str-elcond-mat.supr-con
keywords insulatormottcorrelatedlocalmetalnearnormalpseudogap
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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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