Physics – Condensed Matter – Superconductivity
Scientific paper
1997-07-10
Physics
Condensed Matter
Superconductivity
15 pages in RevteX. Figures available from M. Grilli
Scientific paper
10.1103/PhysRevB.57.4382
The infinite-U three-band Hubbard model is considered in order to describe the CuO_2 planes of the high temperature superconducting cuprates. The charge instabilities are investigated when the model is extended with a nearest-neighbor repulsion between holes on copper d and oxygen p orbitals and in the presence of a long-range Coulombic repulsion. It is found that a first-order valence instability line ending with a critical point is present like in the previously investigated model without long-range forces. However, the dominant critical instability is the formation of incommensurate charge-density-waves, which always occur before the valence-instability critical point is reached. An effective singular attraction arises in the proximity of the charge-density wave instability, accounting for both a strong pairing mechanism and for the anomalous normal state properties.
Becca Federico
Bucci Francesca
Grilli Marco
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