engleski

Y_(1-x)Gd_xBa_2Cu_3O_(7-delta) and YBa_2Cu_(3-x)Gd_xO_(7-delta) : Similarities and Differences

Two different series of samples with the nominal composition Y_(1-x)Gd_xBa_2Cu_3O_(7-delta) and YBa_2Cu_(3-x)Gd_xO_(7-delta) (O less-than or equal to x less-than or equal to 1) were prepared by the solid state reaction. Pronounced sensitivity to Gd content is observed for YBa_2Cu_(3-x)Gd_xO_(7-delta). Besides formation of several impurity phases in this series the transformation of the orthorhombic phase to tetragonal symmetry is observed for x greater-than or equal to 0.1. The ac susceptibility, resistivity and field-dependent microwave absorption measurements show a rapid degradation of superconducting properties as a function of gadolinium content.

superconductors; magnetic properties; superconducting properties; microwave absorption

nije evidentirano