Charge fluctuations: Spin fluctuations and superconductivity in a CuO2 sheet
A. Sudbø, A. Houghton
DOI 10.1103/PhysRevB.42.4105 · Physical Review B
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Abstract
A Ud=∞ Anderson lattice model with a tight-binding band structure is used to model the CuO2 sheets of the high-Tc oxides. The model is treated within a strong-coupling slave-boson method treating spin and charge fluctuations on equal footing. At the mean-field level the normal state is a Fermi liquid at finite doping with a transition to a charge-transfer insulator at half-filling for a large enough charge-transfer gap. Charge fluctuations give rise to a repulsive quasiparticle interaction, but spin fluctuations give rise to an antiferromagnetic exchange interaction and it is shown that this leads to strong-coupling s-wave pairing for physically reasonable values of the charge-transfer gap.
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