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Thermoelectric Properties of the Kondo Semiconductor CeRu4As12 Prepared under High Pressure
Chihiro Sekine,Tomokazu Kawata,Yukihiro Kawamura,Takehiko Yagi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The thermoelectric properties of the Kondo semiconductor CeRu4As12 with a filled skutteruditetypestructure have been studied. The compound CeRu4As12 exhibits a hybridization gap insulatingstate with a small activation energy of 50 K. We report further results for CeRu4As12 synthesized athigh temperatures and high pressures. Seebeck-coefficient and thermal-conductivity measurementshave been performed on this material. The temperature dependence of the Seebeck coefficient forCeRu4As12 shows two peaks (around 90 K and 280 K). The phenomena could be related to theKondo behavior at high temperatures and a hybridization gap-formation process at low temperatures.
Ultrasound Measurements on the Skutterudite Compound SmOs4P12
Yoshiki Nakanishi,Gen Koseki,Dai Tamura,Kohei Kurita,Takeshi Saito,Minoru Koseki,Mitsuteru Nakamura,Masahito Yoshizawa,Yuya Koyota,Chihiro Sekine,Takehiko Yagi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have investigated the elastic properties of the Sm-based filled skutterudite compoundSmOs4P12 for the first time. The measurements were performed on polycrystalline samples preparedat high temperatures and high pressures by using a wedge-type, cubic anvil, high-pressureapparatus. A clear and steep decrease was observed at an antiferromagnetic transition temperatureof 4.5 K in the temperature dependence of both the longitudinal and the transverse elastic constants. Absence of a precursor behavior reminds us of the multipolar ordering, possibly octupolarordering, observed in the isostructural system SmRu4P12. The transition is robust against an externalmagnetic field. We argue that the low-lying degenerate levels derived from the 4f-multipletground state of the Sm ion is split by the crystalline electric field in SmOs4P12. Furthermore, wediscuss the phononic properties, which include the ionic degrees of freedom for the rattling motion,and compare them with the values for other isostructural systems.