スクッテルド鉱型化合物LnRu_4P_12(Ln=ランタニド)の構造と電子物性

概要

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Ternary ruthenium phosphides LnRu4P12 (Ln=La,Ce,Pr,Nd,Sm,Eu,Gd and Tb) with the filled skutterudite-type structure have been prepared at high temperatures and high pressures. The crystal structure of a new compound TbRu4P12 is refined by the Rietveld analysis of the powder X-ray diffraction data. The physical properties of LnRu4P12 have been studied by means of electrical resistivity, magnetic susceptibility, magnetization and specific-heat measurements at low temperatures. LaRu4P12 is a superconductor with the transition temperature (Tc) of 7.2K. CeRu4P12 exhibits a semiconducting behavior. A metal-insulator transition is found at around 60K in PrRu4P12. NdRu4P12 and EuRu4P12 show the ferromagnetic ordering below 1.6K and 20K, respectively. SmRu4P12, GdRu4P12 and TbRu4P12 also show the antiferromagnetic orderings below 15K, 21K and 20K, respectively. Electrical and magnetical properties of LnRu4P12 (Ln=La,Ce,Pr,Nd,Sm,Eu,Gd and Tb) are discussed.
室蘭工業大学の論文
1999-11-30