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常压下得到的YSr2Cu3O7-δ(YSCO)不是超导体,它属于四方晶系钙钛矿结构,用B置换一部分Cu,得到了YSr2(Cu0.5B0.5)Cu2O7-δ,具有无公度调制结构,但仍不是超导体。进一步用Ba部分置换Sr得到了Y(Sr2-xBax)(Cu0.5B0.5)Cu2O7-δ高温超导氧化物,其无公度调制波矢长度随x的增加而减短[1
YSr2Cu3O7-δ (YSCO) obtained under atmospheric pressure is not a superconductor. It belongs to the tetragonal perovskite structure, substituting part of Cu with B to obtain YSr2 (Cu0.5B0.5) Cu2O7-δ, , But still not superconductor. Furthermore, partial replacement of Sr by Sr with Ba resulted in a Cu2O7-δ high-temperature superconducting oxide of Y (Sr2-xBax) (Cu0.5B0.5). The length of the uncoordinated wave vector decreases with the increase of x [1