重Fermi子体系的自发磁矩和反常比热

THE SPONTANEOUS MAGNETIC MOMENT AND SPECIFIC HEAT ANOMALY IN HEAVY FERMION SYSTEM

本文提出重Fermi子体系是一种局域的f电子可以变化的Kondo体系.理论得到在特定温区可以产生自发磁矩,且由f带离Fermi面的距离之不同而存在不同类型的自发磁矩效应.理论并给出由于局域f电子的变化导致重Fermi子体系比热与温度的反常关系.理论与六种重Fermi子材料比热的实验值符合得相当好.

We point out in this paper that the heavy Fermion system is a kind of Kondo system whose localized f-electrons can change with temperature. The theory suggests the existence of spontaneous magnetic moment in particular temperature range. According to the different distance between the f-electron band and Fermi level, there are different types of spontaneous magnetic moment effect. We also point out that the anomaly in specific heat versus temperature-curve is caused by the change of number of f-electron in heavy Fermion system. The theoretical values of specific heat coincide well with six experimental data.