材料期刊网

本文在Bardeen和Pines确定的电子-声子相互作用的有效矩阵元的基础上,讨论了元素之间有化学键的形成,元素之间发生了电子转移,元素的核外层电子发生了变化对电子-声子相互作用的影响.所得结果和Bardeen和Pines,Bohm和Pines早期的工作符合,可由下列事实解释：即元素成键后,成键电子转移后元素的剩余的电子-声子相互作用是非常短程的,更适合用独立粒子的方法;得到电子的元素,受到成键电子的屏蔽,元素上的电子-电子相互作用是短程的,也更适合用独立粒子的方法.由于元素成键受到键电子的屏蔽作用,电声子相互作用中电子之间的库仑作用对于超导性的影响也已经证明是小的.

On the basis of the effective matrix elements produced by the interactions between the electrons and phonons decided by Bardeen and Pines,the formation of the chemical bonds between the elements,the occurrence of the transitions of electrons between the elements and the influence made by the changes of the electrons of the elements at the nuclear out layer on the interactions between the electrons and phonons were discussed.The obtained results were in harmony with the conclusions made by Bardeen and Pines and Bohm and Pines in the early work,which can be explained by the following facts,i.e.after the elements are bonded,the interaction between the remained element electrons after the transition of the bonded electrons and the phonons is of very short distance and more suitable to the method of indispensable particles.Meanwhile,because the elements having obtained electrons are screened by the bonded electrons,the interactions on the element electrons and electrons are of short distance,which is even more suitable to the method of indispensable particles.Because the bond of the elements are influenced by the screening of the bonded electrons,it was proved that the influence of the Coulomb functions between the electrons in interactions between the electrons and phonons on the superconductivity is small.