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Compounds in the (PrGd0.8A0.2)CuOz (A=Ca, Sr) systems were prepared by the solid-state reaction. The PrGd0.8Sr0.2CuOz was crystallized to the T-type structure whereas the PrGd0.8Ca0.2CuOz was crystallized to the T′-type one. The electrical conductivity and the magnetic susceptibility measurements showed that the compounds containing Sr were bulk superconductors with Tc=50-60K after the treatment in oxygen atomspheres at pressures of 7-10MPa at 300°C. The oxidizing treatment converted Cu ions to the high valence state, but did not change the valence state of Pr ions. It became clear that the preferential oxidation of Cu ions in the T-type compounds containing Sr genarates the superconductivity.

Preparation and Superconductivity of the T-type (PrGd0.8A0.2)CuOz Compounds (A=Ca, Sr)

Preparation and Superconductivity of the T-type (PrGd_0.8A_0.2)CuO_z Compounds (A=Ca, Sr)