| Journal: | Revista mexicana de física |
| Database: | PERIÓDICA |
| System number: | 000363621 |
| ISSN: | 0035-001X |
| Authors: | Murer, M1 Opata, Y. Aparecido1 Monteiro, J.F.H. Leandro1 Silva, S. Aparecida da1 Rodrigues-Júnior, P1 Jurelo, A.R1 |
| Institutions: | 1Universidade Estadual de Ponta Grossa, Departamento de Física, Ponta Grossa, Parana. Brasil |
| Year: | 2012 |
| Season: | Oct |
| Volumen: | 58 |
| Number: | 5 |
| Pages: | 404-410 |
| Country: | México |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, teórico |
| English abstract | This paper reports on measurements of the resistive transition in polycrystalline Gd1-χ Ceχ Ba2 Cu3 O7-δ samples (x = 0.000, 0.025 and 0.050). The samples were produced by a standard solid state reaction method and in two different thermal routes. The microstructure was analyzed by X-ray diffraction. The samples were considered homogeneous since no extra peaks due to impurity phase were observed. To identify power-law divergences in conductivity, the results were analyzed in terms of the temperature derivative of the resistivity and the logarithmic temperature derivative of the conductivity (d ln (Δσ) /dT). From the results, the occurrence of a two-stage transition besides the pairing transition splitting for sample with x = 0.050 was observed. Such splitting was associated with Ce doping and related with the occurrence of a phase separation. In the normal phase, Gaussian and critical fluctuations conductivity regimes were identified. Ón approaching the zero resistance state, our results showed a power-law behavior that corresponds to a phase transition from a paracoherent to a coherent state of the granular array |
| Disciplines: | Física y astronomía |
| Keyword: | Física de materia condensada, Superconductor de alta temperatura, Policristales, Gadolinio, Cerio, Fenómeno crítico, Efectos de fluctuación |
| Keyword: | Physics and astronomy, Condensed matter physics, High-TC Superconductor, Polycrystals, Gadolinium, Cerium, Critical phenomena, Fluctuation Effects |
| Full text: | Texto completo (Ver PDF) |
