ملخص: The GdBa2-xLaxCu3O7 series has been prepared and studied by XRD, magnetic a.c. susceptibility and microwave absorption. The transition temperature Tc, as a function of the doping level, shows a nonlinear variation in two steps indicating a hole filling phenomenon joined to an oxygen reorganization between a and b axis. Microwave absorption study confirms the decrease of the dephasing field Hd of the Josephson junctions as increasing the La ratios. The irreversible domain studied by a.c. susceptibility is reduced and the Ba substitution by La does not constitute a defect for pinning the vortices into the structure.

لغة: إنجليزية