| Journal: | Revista mexicana de física |
| Database: | PERIÓDICA |
| System number: | 000426104 |
| ISSN: | 0035-001X |
| Authors: | Millán, B1 Pérez, L.A2 Millán, J. Samuel3 |
| Institutions: | 1Universidad Nacional Autónoma de México, Instituto de Investigaciones en Materiales, Ciudad de México. México 2Universidad Nacional Autónoma de México, Instituto de Física, Ciudad de México. México 3Universidad Autónoma del Carmen, Facultad de Ingeniería, Ciudad del Carmen, Campeche. México |
| Year: | 2018 |
| Season: | May-Jun |
| Volumen: | 64 |
| Number: | 3 |
| Country: | México |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, teórico |
| English abstract | A single-band generalized Hubbard model that describes two-dimensional superconductivity with d-wave symmetry on a square lattice within the BCS formalism is considered. For a set of Hamiltonian parameters and varying the ratio between nearest-neighbor and next-nearest neighbor hoppings (t'/t); an optimal electron density (nop) can be found for each t'/t value, where the temperature is maximum (Tc-max). After calculating the superconducting gap at T=0 K and the corresponding ground state energy (Eg) for all the carrier concentrations, a ground state energy minimum (Eg-min) is found close to half filling. Since Tc-max is the highest critical temperature for a given ratio t'/t, the minimum of all the Tc-max values defines a supreme for this set of temperatures, named as Tc-max-sup . The corresponding optimal doping for Tc-max-sup will be called nop-sup, and the results show that Eg-min is located at nop-sup. The Fermi surface (FS) is analyzed for carrier concentrations close to nop-sup and it is suggested that the location for over (OD) and under (UD) doping regimes (nOD > nop-sup > nUD) could define a pseudogap zone for high critical temperature superconductors |
| Disciplines: | Física y astronomía |
| Keyword: | Física, Teorías y modelos del estado superconductor, Simetrías de emparejamiento, Régimen de pseudogap |
| Keyword: | Physics, Theories and models of superconducting state, Pairing symmetries, Pseudogap regime |
| Full text: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
