| Revista: | Revista mexicana de física |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000447375 |
| ISSN: | 0035-001X |
| Autors: | Millán, B1 Hernández Hernández, I.J2 Pérez, L.A3 Millán, J. Samuel4 |
| Institucions: | 1Universidad Nacional Autónoma de México, Instituto de Investigaciones en Materiales, Ciudad de México. México 2Instituto Nacional de Investigaciones Nucleares, Ocoyoacac, Estado de México. México 3Universidad Nacional Autónoma de México, Instituto de Física, Ciudad de México. México 4Universidad Autónoma del Carmen, Facultad de Ingeniería, Ciudad del Carmen, Campeche. México |
| Any: | 2021 |
| Període: | Nov-Dic |
| Volum: | 67 |
| Número: | 6 |
| País: | México |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Analítico, teórico |
| Resumen en inglés | Recently, within a generalized Hubbard model which includes correlated nearest (Δt) and next-nearest hopping interactions (Δt3), a comparative study between d- and s*- wave superconducting ground states on a square lattice was performed. It was found that the critical temperature of transition T c (n), as a function of the electron concentration n, reaches a maximum (T c-max ) at a given optimal doping (n op ) for each value of the ratio t´/t, where t and t´ are the tight-binding nearest and next-nearest hopping parameter of a square lattice, respectively. From all values obtained for T c - m a x ( t ' / t , n o p ) a global minimum one was encountered for both symmetries. Likewise, in the same space, a minimal ground state energy Eg was also obtained. For d-wave channel both minima are localized around the same optimal doping. However, for s* symmetry, the two minima are located at different electron concentrations. In this work, we additionally study how the p-wave ground-state energy and the critical temperature depend on the hoppings parameters and the electron concentration. The results show that for p-wave, minimum global values of T c-max and Eg in the ( t ' / t , n o p ) space do exist too, and are found around half filling but, as occurs for s *- wave, the minimum of T c-max does not occur at the same point as Eg. Moreover, we present a ground-state phase diagram in the space ( t ' / t , n o p ) where it is possible to find zones of coexistence and competition between the s*-, p- and d-wave symmetries. Also, an analysis of the shape of the Fermi surface and the single-particle energy, as functions of the wave vector of an electron in the Cooper pair, has been done for different regions of the mentioned space |
| Disciplines | Física y astronomía |
| Paraules clau: | Física, Estado superconductor, Simetrías de emparejamiento, Régimen de pseudobrecha |
| Keyword: | Physics, Superconducting state, Pairing symmetries, Pseudogap regime |
| Text complet: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
