Investigation of the Filled Skutterudite Compounds

我们研究了CeRu4Sb12在低温下的非费米液体行为，并制备了高质量的sm基化合物单晶。我们测量了比热和电阻率，明确了CeRu4Sb12接近铁磁不稳定性。低温下的非费米液体行为归因于量子临界现象。我们进行了高分辨率的光发射研究，发现在低温下，费米能的态密度减小，因此CeRu4Sb12属于近道半金属。我们成功地制备了高质量的SmFe4P12单晶，并证明了该化合物是具有铁磁基态的近道晶格体系。众所周知，很少有化合物表现出铁磁性，SmFe4P12是第一个具有铁磁性基态的sm基重费米子体系。我们也成功制备了SmRu4P12和SmOs4P12的小单晶，但需要更大的样品来测量物理性质。

We have investigated the non-Fermi liquid behavior in CeRu4Sb12 at low temperatures and preparation of high quality single crystals of Sm-based compounds. We have measured the specific heat and electrical resistivity and clarified that CeRu4Sb12 is near ferromagnetic instability. The non-Fermi liquid behavior at low temperatures is ascribed to the quantum critical phenomena. We have done high resolution photoemission study and revealed that the density of state at the Fermi energy decreases at low temperatures and hence CeRu4Sb12 belongs to Kondo semimetal. We have succeeded preparations of high quality single crystals of SmFe4P12 and shown that the compound is Kondo-lattice system with a ferromagnetic ground state. It is known that few compounds exhibit a ferromagnetism and SmFe4P12 is the first Sm-based heavy fermion system with a ferromagnetic ground state. We also succeeded preparations of small single crystals of SmRu4P12 and SmOs4P12 but it requires larger specimen to measure physical properties.