Novel Kondo Behaviors Realized in the Filled Skutterudite Structure(<SPECIAL TOPICS>Kondo Effect-40 Years after the Discovery)
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概要
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Novel Kondo-like behaviors realized in the Pr-based filled skutterudites are reviewed based on the electronic transport properties, specific heat and de Haas-van Alphen (dHvA) experiments, along with the band structure calculations. As references, the experiments on the related La- and Ce-filled skutterudites are also studied and discussed. PrRu_4Sb_<12> is an ordinary BCS superconductor without f-electron-derived mass enhancement. PrRu_4P_<12> exhibits a metal-semiconductor transition at 62K and an anomaly with a small characteristic energy at low temperatures. The Fermi surface (FS) topology is very similar between the first known heavy fermion superconductor PrOs_4Sb_<12> and the reference compound LaOs_4Sb_<12>, suggesting the well-localized character of 4f-electrons in PrOs_4Sb_<12>. In contrast, the topology of the FS of PrFe_4P_<12>, which exhibits apparent Kondo behaviors at high temperatures and the field-induced heavy fermion state at low temperatures, is as a whole different from that of LaFe_4P_<12>, although partial similarity is visible between the two. For both PrFe_4P_<12> and PrOs_4Sb_<12>, de Haas-van Alphen experiments revealed strongly enhanced cyclotron effective masses, in reasonable agreement with the large specific heat coefficients. The ground state is settled to be non-magnetic, and anomalous antiferro-electronic-quadrupole (orbital) ordering of Pr-ions are realized in zero field for PrFe_4P_<12> and under magnetic fields for PrOs_4Sb_<12>, suggesting that the quadrupole degrees of freedom play key roles in the heavy-fermion and the exotic superconducting behaviors. The novel features realized in the Pr-filled skutterudites are discussed in relation with the unique crystal structures.
- 社団法人日本物理学会の論文
- 2005-01-15
著者
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SUGAWARA Hitoshi
Department of Physics, Tokyo Metropolitan University
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Hidaka Hiroyuki
Graduate School Of Natural Science And Technology Okayama University
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Aoki Yuji
Department Of Chemistry Faculty Of Science Gakushuin University
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Harada H
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Harima H
Department Of Physics Graduate School Of Science Kobe University
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Harima Hisatomo
Isir-sanken Osaka University
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Harima Hisatomo
Department Of Condensed Matter Physics The Institute Of Scientific And Industrial Research Osaka Uni
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Harima Hisatomo
Department Of Physics Kobe University
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Sato Hideyuki
Department Of Cardiology Osaka University Graduate School Of Medicine
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HISATOMO Harima
Department of Physics, Faculty of Sciences, Kobe University
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Sato Hideyuki
Department Of Applied Chemistry Faculty Of Science And Technology Keio University
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SUGAWARA Hitoshi
Department of Physics, Tokyo Metropolitan University:(Present address)Faculty of Integrated Arts and Sciences, The University of Tokushima
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SUGAWARA Hitoshi
Department of Mathematical and Natural Sciences, Faculty of Integrated Arts and Sciences, The University of Tokushima
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