The f-electron system in rare-earth and actinide compounds exhibit a variety of characteristic properties including heavy fermions and unconventional superconductivity. The Fermi surface properties in rare-earth and actinide compounds are clarified by the de Haas-van Alphen experiments on the basis of the results of energy band calculations. The effect of pressure on the electronic states of CeRhIn 5 , CeIrSi 3 , and YbIr 2 Zn 20 is studied in magnetic fields. An electronic instability, including unconventional superconductivity, occurs at 2.4 GPa in CeRhIn 5 and 2.6 GPa in CeIrSi 3 . An abrupt non-linear increase in the magnetization, namely, a metamagnetic behavior, is found in the heavy fermion compounds, including YbT 2 Zn 20 (T: Co, Rh, Ir). A super-heavy fermion state with a specific heat coefficient of 10 J/(K 2 ·mol) is realized in YbIr 2 Zn 20 under pressure.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)