مدهاي فونوني در تركيب ابررساناي DGD1-XCEXBA2CU3O7DELTA

Phonon modes in Gd1-xCexBa2Cu307-5

XRD and Raman analyses were performed to probe the phase formation and the variation of the normal phonon frequencies of the high temperature superconductor GdBa2Cu307-6 upon Ce doping. It was found that in addition to the orthorhombic 123 phase, some nonsuperconducting peaks, which are mainly due to the BaCe03 secondary phase, are also formed that suppress the superconducting transition temperature. Besides, analysis of the Raman peaks shows that substitutions of Ce for Gd in GdBa2Cu307_6 are restricted to low concentrations in favor of impurity island formation.