Investigation of the electronic structure of heavy fermion superconductor under high pressure

由于RKKY相互作用和Kondo效应的竞争，在稀土和吖系化合物中，实现了各种电子基态，如磁性有序、重费米子和非传统超导电性。在本研究中，我们研究了几种Ce和Yb化合物在高压、强磁场和低温下的电子性质。研究了压致重费米子超导体CePtSi_2、CeRhGe_2、CePd_5Al_2以及非中心对称化合物CeIrGe_3的物理性质。研究还发现，在量子临界点附近的高压下，YbIr_2ZN_(20)&gt；呈现出极重的费米子态。

In rare-earth and actinide compounds, various kinds of electronic ground states such as magnetic ordering, heavy fermion, and unconventional superconductivity are realized as a result of the competition between the RKKY interaction and the Kondo effect. In this research, electronic properties of several Ce- and Yb- compounds are investigated under high pressure, high magnetic field, and low temperature. Physical properties of pressure induced heavy fermion superconductors such as CePtSi_2, CeRhGe_2, and CePd_5Al_2 as well as a non-centrosymmetric compound CeIrGe_3 have been investigated. It is also found that YbIr_2Zn_<20> exhibits an extremely heavy fermion state under high pressure near the quantum critical point.