First Single Crystal Growth of the Transuranium Filled-Skutterudite Compound NpFe_4P_<12> and Its Magnetic and Electrical Properties(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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We succeeded in growing single crystals of NpFe_4P_<12> using the Sn-flux method and measured the electrical resistivity, magnetic susceptibility, magnetization, and specific heat. This is the first single crystal growth of transuranium filled-skutterudite compounds. NpFe_4P_<12> is found to order ferromagnetically below T_c=23K. The magnetic moment is directed along the <100> direction with the saturated moment of 1.35μ_B/Np. The large resistivity value indicates that NpFe_4P<12> might be a semimetal, where the 5f electrons are localized with a 5f^3 configuration, indicating Np^<4+>. The electronic specific heat coefficient γ is found to be small, γ≃10mJ/(K^2・mol), which is consistent with the low carrier system.
社団法人日本物理学会の論文
2006-07-15