Superconducting gap and magnetic field effects in Bi2Sr2CaCu2O8
Résumé
Superconductinq properties of Bi2Sr2Cacu2oa films have been measured using the infra-red spectroscopy technique at fixed frequency. It is possible with this technique to determine the variation of the order parameter as a function of temperature and the critical magnetic field as a function of temperature. This last result together with the BCS theory allows a determination of the Fermi velocity
in the a-b plane of the structure.