Model of Preformed Hole-Pairs in c-Axis Transport in Cuprate Superconductors

• 作者: Rana Janardan Singh
• 来源期刊: 凝固态物理国际期刊(英文)
• 学科: 医学
• 关键词: CUPRATE SUPERCONDUCTORS PREFORMED Hole-Pairs Electron PARAMAGNETIC Resonance 41 meV Peak in Neutron Diffraction
• 年，卷（期）: ngtwlgjqkyw_2012,（4）
• 页码范围: 228-236
• 页数: 9页
• 分类号: R73

摘要

Model of hole-pairs in electrical transport along ab plane in cuprate superconductors has already been proposed. It has been found to be in the shape of 3dx2–y2 orbital of an electron in an atom. This time, model of hole-pairs in transport along c-axis in cuprate superconductors is proposed. In ab-plane, hole-pairs are formed along CuO2 plane;one hole-pair covering 9 - 10 two dimensional CuO2 unit cells in 3dx2–y2 configuration. In the investigation of c-axis hole-pairs, cuprate superconductors have been sub-divided into three categories depending on the number of CuO2 planes/formula unit. There is a little different treatment for finding out the order parameter in each category. Coherence lengths along ab-planes are of the order of a few tens of Angstroms, whereas along c-axis, they are less than even their a-, b-lattice constants. In cuprates with 2 or 3 CuO2 planes, the order parameter is of 3dz2–x2 type in zx-plane with lobes along both the axes much constrained. For cuprates with a single CuO2 layer, the order parameter is of 3dx2–y2 type, but its dimensions are less than a-, b-lattice constants.