【摘要】 将重费米子超导体看成由s电子和f电子组成的系统,得到了一种可能的低能元激发模——超声Plasmon。证明在一定条件下,电子间通过交换这种低能集体元激发模,除了可导致s电子形成Cooper对外,同时还可导致s-f电子间混合对的形成。对系统的介电函数作了RPA近似计算,得到了超导转变温度的表达式,并讨论了混合对效应。另外,通过对比热反常的分析,讨论了在重费米子超导体中存在超声Plasmon模的可能性。更多还原

【Abstract】 A possible low-lying exitation mode, the acoustic plasmon, in the heavy-fermion superconductors with s and f electrons has been obtained. It was shown that under certation conditions the acoustic plasmon exchange between electrons can lead to the formation of not only s-s electron pairs, but also s-f electron hybrid pairs. The RPA approximation is used to calculate the dielectric function, to derive the expression for the superconducting transition temperature and to discuss the effect of hybrid pairs. In addition, the possibility of existence of the acoustic plasmons in the heavy-fermion superconductors was examined based on the analysis of the anomalies in the specific heat.更多还原