Synthesis and superconducting properties of the infinite-layer compounds Sr"1"-"xLn"xCuO"2(Ln=La, Nd, Sm, Gd) - Ikeda, N.; Hiroi, Z.; Azuma, M.; Takano, M.; Bando, Y.; Takeda, Y. (Elsevier)
Infinite-layer-type superconductors Sr"1"-"xLn"xCuO"2 are synthesized under high pressure of 3 GPa for Ln=Sm, Gd as well as for Ln=La, Nd. Their chemical and superconducting properties are systematically studied as functions of doping concentration and the kind of lanthanide ion. As a result, it is demonstrated that the variation of these properties with doping concentration is similar for all the examined Ln^3^+ ions. The solubility limit lies at x ~ 0.10. CuO"2 sheets are expanded with increasing x, while their spacing decreases. The T"c onset determined by magnetic measurements remains constant for any doping concentration; only the Meissner fraction increases with increasing x.
http://linkinghub.elsevier.com/retrieve/pii/0921-4534(93)90979-Z
Keywords: U