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产生超导电性须具备两个条件,即结构中有 CuO_2平面和在CuO_2,平面上引入适当浓度的载流子。为满足这两个条件,最简单的结构当然就是仅由CuO_2,平面层和阳离子层交替构成的结构。这种无限层结构材料的化学式为ACuO_2,1988年,无限层结构材料首先由西格里斯特(Siegrist)小组采用常压下的固相反应法合成,其组分为Ca_(0.86)Sr_(0.14)CuO_2,但这种方法获得的样品并不具有超导电性。1991年,高野(Takano)小组率先合成无限层结构的超导体BaSrCuO。他们的成功之处在于对
Produce superconductivity must have two conditions, that is, the structure of the CuO_2 plane and in the CuO_2, the introduction of the appropriate concentration of carriers. To meet these two conditions, the simplest structure is, of course, a structure consisting only of CuO_2, planar layers and cationic layers. The chemical formula of this infinite layer structure material is ACuO_2. In 1988, the infinite layer structure material was first synthesized by the Siegrist group using the solid state reaction under atmospheric pressure and its composition was Ca 0.86 Sr 0.14 ) CuO 2, but the sample obtained by this method does not have superconductivity. In 1991, the Takano group pioneered the synthesis of a superconductor BaSrCuO of infinite layer structure. Their success lies in the right