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d-Wave superconductivity in the effective extended Hubbard model for cuprates

โœ Scribed by L. Arrachea; A.A. Aligia

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
234 KB
Volume
408-410
Category
Article
ISSN
0921-4534

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โœฆ Synopsis

We consider the effective extended Hubbard Hamiltonian for the cuprates, with nearest-neighbor hopping which depends on the occupation. Using exact diagonalization in a 4 โ€ข 4 cluster, we obtain a large enhancement of d-wave pairing correlation functions for optimum doping. The physical picture is consistent with magnetic measurements, the pseudogap and the kinetic energy gain in the cuprates.

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The two-dimensional Hubbard model has been studied within the Composite Operator Method (COM) [1] starting from a basis made of the two Hubbard composite fields in the Nambu representation and computing the residual self-energy in the non-crossing approximation (NCA) [2]. The charge-charge, spinspin