Modified two-band two-dimensional hubbard model for the description of the high critical temperature superconducting phase transition in cuprates
A progress report on the development of numerical and rigorous solutions of the effective two-band two-dimensional Hubbard model of the high-temperature superconductivity in cuprates [N.M. Plakida et al., PRB 51, 16599 (1995)], within the equation of motion technique of the thermodyna...
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| Autores principales: | , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
D.Ghitu Institute of Electronic Engineering and Nanotechnologies
2011
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/a94ca3e21cc24902af8c8760acc54777 |
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| Sumario: | A progress report on the development of numerical and rigorous solutions of the effective
two-band two-dimensional Hubbard model of the high-temperature superconductivity in cuprates
[N.M. Plakida et al., PRB 51, 16599 (1995)], within the equation of motion technique of the
thermodynamic Green function approach, is given. Four important consequences of the rigorous
mean-field solution are worth mentioning: (1) Occurrence, both in the normal and
superconducting states, of the spin-charge separation, conjectured by P.W. Anderson on intuitive
grounds. (2) Origin of the static d-wave pairing in the hopping singlet conduction. (3) Complete
suppression of the s-type superconducting pairing by the crystal symmetry in square two-
dimensional lattices and occurrence of a residual s-type term in rectangular lattices, in agreement
with the experiment. (4) The energy band hybridization in the superconducting state points to an
overall displacement of the energy spectrum toward lower energies, as pointed by very precise
optical measurements. |
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