SUPERCONDUCTIVITY IN A LAYERED PEROVSKITE WITHOUT COPPER
SUPERCONDUCTIVITY IN A LAYERED PEROVSKITE WITHOUT COPPER
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DOI：
10.1038/372532a0
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发表时间：
1994-12-08
期刊：
影响因子：
64.8
通讯作者：
LICHTENBERG, F
中科院分区：
文献类型：
--
作者：
MAENO, Y;HASHIMOTO, H;LICHTENBERG, F
在La2-xBaxCuO4中发现了类似于30K的超导性之后（参考文献1），大量相关化合物被发现在相对较高的温度下具有超导性。所有这些材料的共同特征是基于钙钛矿模板的层状晶体结构，并包含铜和氧的平面网络。这就提出了一个问题：超导性是否会发生在不含铜的层状钙钛矿中。据我们所知，尽管经过了近十年的寻找，迄今为止还没有发现这样的材料。我们在这里描述了Sr2RuO4中超导性的发现，Sr2RuO4是一种与La2-xBaxCuO4相同结构的层状钙钛矿（图1）。我们的结果表明，铜的存在并不是层状钙钛矿中超导性存在的先决条件。但低的超导转变温度（T-c= 0.93 K）表明铜在高温超导体中的特殊作用。
FOLLOWING the discovery of superconductivity at similar to 30K in La2-xBaxCuO4 (ref. 1), a large number of related compounds have been found that are superconducting at relatively high temperatures. The feature common to all of these materials is a layered crystal structure based on a perovskite template and containing planar networks of copper and oxygen. This raises the question of whether superconductivity can occur in layered perovskites that do not contain copper. To the best of our knowledge, no such material has been found to date, despite nearly a decade of searching. We describe here the discovery of superconductivity in Sr2RuO4, a layered perovskite isostructural with La2-xBaxCuO4 (Fig. 1). Our results demonstrate that the presence of copper is not a prerequisite for the existence of superconductivity in a layered perovskite. But the low value of the superconducting transition temperature (T-c= 0.93 K) points towards a special role for copper in the high-temperature superconductors.