Investigation of Magnetic Properties of Superconductors Y0.98−xCaxCo0.02Ba2Cu3O7−δ --- Physica C 549 (2018) 171
Sepideh Pourasad, Hamideh Shakeripour*, SeyedSajad Hosseini, Hadi Salamati
The effect of Co2+,3+and Ca2+ substitution in Y3+ site in YBa2Cu3O7-δ superconductor has been studied. The series of high temperature superconducting samples of Y1-y-xCoyCaxBa2Cu3O7-δ with 0≤x≤0.015 and y=0.020 were prepared by solid-state reaction method. The samples were characterized for phase purity and lattice parameter variations by X-ray diffraction. The AC susceptibility curves, c'(T), show that in reserving cobalt fixed sample with the optimum Tc, by substitution of divalent Ca2+ at the trivalent Y3+ site no sensitive increasing happen in the superconducting transition temperature.