Crystal Structure, Magnetic and Transport Properties of New Ruthenate Phase, Ba_2Ru_7O_<18>(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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A new phase of ternary ruthenium oxide, I^RuvOis, is discovered. The lattice parameters are: triclinic, a = 6.71(4)Å, b = 7.10(4)Å, c = 7.46(4)Å, α = 93.2(2)°, β = 94.6(2)°, γ = 115.7(2)°. It has a Ba_2Zn_7F_<18>-type structure composed of an egde-shared and corner-shared network of RuO_6 octahedra.The magnetic susceptibility around room temperature exhibits a Pauli paramagnetism with a relatively large value of χ = 3.4 × 10^<-4> emu/mol at 300 K, while it exhibits a large temperature dependence in the low temperature range without any evidence of magnetic phase transitions down to 2 K. The resistivity at 300 K is 1.1 × 10^<-3> Ωcm, larger than that of normal metal. Unlike conventional metals, the resistivity exhibits T^<1.2>-linear dependence in the low temperature region. These anomalous behaviors of magnetism and resistivity can be interpreted in terms of the non-Fermi liquid state.
社団法人日本物理学会の論文
2003-12-15