High Tc Superconductivity Based on the Square Planar [CuO4]∞-Bonding System K2NiF4-Type (A, A*)2CuO4 and Oxygen-Deficient Perovskite (Ba2A)Cu3O7
- 1 May 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (5A) , L678
- https://doi.org/10.1143/jjap.26.l678
Abstract
Based upon the experimental evidences and inferences, the almost filled σ-electron band embedded in the extended two-dimensional or one-dimensional square planar [CuO4]∞-bonding system is identified to be the unique high T c superconductivity possible band, because it is a pseudo-inner orbital, muffled and isolated from the outer phonon systems by the other filled, localized orbitals. A high Debye temperature θD=770-800K is evaluated for the [CuO4]∞-bonding system. An ideal structural model for (Ba2Y)Cu3O7, which explains the orthorhombic constants and the high pressure behavors of T c of this material is proposed.Keywords
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