紧密堆积结构化合物的超导临界温度和导带的异质杂化

用LMTO能带论方法分析了密堆结构复式格子的导带中角动量杂化情况变化的规律。指出异质配位(在最近邻位置上出现电子结构差异大的原子)是显著强化导带的角动量杂化程度的必要条件。结合前人对电子-声子耦合超导原理的研究结果,可以对密堆结构化合物得出如下关系:高T_c高η强的角动量杂化强异质配位。这个原理与A15结构,B1结构及其它多种密堆结构化合物的多方面的实验结果普遍符合。 关键词：

SUPERCONDUCTING Tc AND HETEROGENEOUS HYBRIDIZATION IN CLOSE-PACKED COMPOUNDS

The hybridization of conduction band is studied for close-packed compounds by means of LMTO method. We emphasize that the heterogeneous coordination would be a necessary condition for intensifying hybridization. In view of the hitherto basic understanding on electron-phonon coupling, a scheme of relation can be outlined as follows: high T_c => high η => significant hybridization=> significant heterogeneous coordination Various experimental results on A15, Bl and other close-packed compouds are in fair agreement with this basic principle.