| Journal: | Revista mexicana de física |
| Database: | PERIÓDICA |
| System number: | 000447130 |
| ISSN: | 0035-001X |
| Authors: | Millán, B1 Hernández Hernández, I.J2 Pérez, L.A3 Millán, J. Samuel4 |
| Institutions: | 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 |
| Year: | 2021 |
| Season: | Mar-Abr |
| Volumen: | 67 |
| Number: | 2 |
| Pages: | 312-317 |
| Country: | México |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, teórico |
| English abstract | In a previous work reported in this journal, the thermodynamical properties of d-wave superconducting ground states close to half filling were obtained by using a generalized Hubbard model. In the present work, extended s-wave (s*) symmetry superconducting ground states are considered within the same model and a comparison is made between these two symmetries for those properties depending on the carrier density (n) and first- (t) and second-neighbor (t’) electron hopping parameters. For s*-wave superconducting states, the electron-electron interaction Hamiltonian parameters is fixed as in the d-wave case with ∆t = 0.5 eV, ∆t3 = 0.05 eV, and two cases were studied; U = 0 and U = 2 eV. Without considering the diluted regime (n → 0), in the interval n ∈ [0,1], for both symmetries, the maximum critical temperatures (Tc,max) at optimal doping (nop) are lower than those attained at high electron densities n ∈ [1,2]. The superconducting gap at T = 0 K and the corresponding ground state energy (Eg), for all the carrier concentrations, were also obtained. The superconductor state with d-wave symmetry does not depend on U and a supremum for nop(nop,sup), where both Tc,max (nop,t’ and Eg(nop,t’ are minimum, can be found close to half filling. However, in general, for a s*-wave superconductor Tc,max and Eg attain their minimum values at different (nop,t’) points and a nop,sup cannot be properly defined |
| Disciplines: | Física y astronomía |
| Keyword: | Física, Estado superconductor, Simetrías de emparejamiento, Régimen de pseudobrecha |
| Keyword: | Physics, Superconducting state, Pairing symmetries, Pseudogap regime |
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