压力环境下重费米子体系的物性探索

Exploring heavy-Fermion systems under pressure

重费米子体系是近藤晶格中的强关联电子系统,它由于电、磁等相互作用的竞争呈现出丰富的电子基态,而且由于各种相互作用的能量尺度较小,它会对外界参量(压力、掺杂、磁场)的调控比较敏感。文章论述了重费米子体系的基本性质和它在压力环境下的物性演变以及相关的量子临界现象。超导态一般会出现在量子临界点附近,文章特别以"115"超导体系为例,讲述了超导态与其他长程序共存时可能出现的纹络化结构,介绍了如何运用压力下的谱学测量(如转角比热、软点接触隧道谱)来研究压力下重费米子体系的物性特别是超导序参量的对称性。

Heavy-Fermion system is a prototype of strongly correlated electron systems, which displays a rich degree of ground states due to the coexisting and competing interactions such as Coulomb and magnetic interactions. Meanwhile, different ground states can be tuned back and forth with controlling parameters such as pressure, doping and magnetic field. In this article, general behav- iors of heavy-Fermion systems under pressure are discussed and the researches on superconductivity and quantum critical phenomena are of the focus, which have deepened our understanding on the strongly-correlated electron systems. Interesting results on the so called 115 family are taken as an ex- ample to demonstrate how superconductivity emerges in a textured form with the coexisting antiferro- magnetic order and how to apply different spectroscopic methods （field-rotational heat capacity, soft point-contact spectroscopy） to investigate heavy-Fermion systems under pressure, especially the su- perconducting order parameter.