On the width of the full-critical region for thermal fluctuations around the superconducting transition in layered superconductors
Laboratorio de Bajas Temperaturas y
Superconductividad Departamento de Física de la Materia Condensada,
Universidad de Santiago de Compostela - E-15706 Spain
Accepted: 14 June 1997
The crossover temperature between the mean-field and the full-critical regions for the thermal fluctuations around the superconducting transition is calculated for the first time in single-layered and bilayered (with two different distances and tunneling couplings between adjacent layers) superconductors at zero applied magnetic field. These results show, in particular, that the width of the full-critical region is somewhat smaller in layered superconductors than in equivalent bulk materials. These results are then discussed in connection with the superconducting transition of the high-Tc copper oxide superconductors.
PACS: 64.60.-i – General studies of phase transitions / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
© EDP Sciences, 1997