Exotic Heavy-Fermion State in Filled Skutterudite SmOs_4Sb_<12>(Condensed Matter: Structure, Mechanical and Thermal Properties)
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概要
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Specific heat and transport measurements have revealed an unconventional heavy-fermion (HF) state in SmOs_4Sb_<12> single crystals. The electronic specific-heat coefficient (γ=0.82J/K^2mol) and the coefficient (A) of the quadratic temperature dependence of electrical resistivity are largely enhanced, although the ratio Aγ^<-2> is reduced from the Kadowaki-Woods ratio of HF materials. Both γ and A do not show any significant decrease in applied field in contrast with Ce-based HF compounds, suggesting an unconventional origin of the heavy quasiparticles. A weak ferromagnetic ordering sets in below ∿3K, probably originating in the itinerant quasiparticles.
- 2005-01-15
著者
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Sanada Shotaro
Department Of Physics Tokyo Metropolitan University
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Aoki Yuji
Department Of Chemistry Faculty Of Science Gakushuin University
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Kikuchi Daisuke
Department Of Applied Chemistry Muroran Institute Of Technology
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Aoki Hidekazu
Department Of Physics Tohoku University
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Tsuchiya Akihisa
Department Of Physics Tokyo Metropolitan 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 General Internal Medicine, Omiya Medical Center, Jichi Medical University
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