重费米子系统低温正常态比热的理论研究  

THEORETICAL STUDY OF SPECIFIC HEAT IN NORMAL STATE AT LOW TEMPERATURES OF HEAVY FERMION SYSTEM

作　　者：陈长风[1] 王鈜[2] 章立源[2] 

机构地区：[1]北京大学技术物理系 [2]北京大学物理系

出　　处：《低温物理学报》1989年第1期12-16,共5页Low Temperature Physical Letters

摘　　要：本文考虑由重费米子系统中的相干性导致的态密度在费米能附近出现赝能隙,提出了一个计算这类系统正常态比热的公式,并系统研究了不同参数情况下比热变化的行为。结果表明赝能隙对低温比热有较大影响。我们拟合了CeAk_3常压和加压情形下的实验数据,得到了相符较好的结果。Considering the existence of a pseudogap near the Fermi energy in density of states resuked from the coherence in heavy fermion system, we suggest a formula to calculate the specific heat in normal state for such system. The behavior of the specific heat under various parameters is studied systematically and the results show that the pseudogap has considerable influence on specific heat at low temperatures. The experimental data of CeAl3 under atmospheric and applied pressures have been fitted obtaining satisfactory results.

关 键 词：重费米子系统 低温比热 

分 类 号：O513[理学—低温物理]