Correlation between Tc, in-plane Cu-O-Cu bond length, and buckling of the CuO2 plane in cuprate superconductors

摘要

Correlation between transition temperature, in-plane copper-oxygen-copper bond length and buckling of the CuO2 plane in optimally doped copper oxide superconductors was investigated. As for cuprates with double CuO2 layers, all the compounds had buckling type distortion in a CuO5 pyramid. The degree of distortion was determined only by a kind of cation between the two facing CuO5 pyramids, that is, calcium or yttrium. A higher transition temperature was obtained for a copper oxide with having larger Cu-O-Cu length and smaller buckling degree. [References: 11]