Anomalous Fermi Liquid Behavior of the Dilute Uranium Alloys La_1-xU_xRu_2Si_2 (x≥0.07)(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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Low temperature properties of the dilute uranium alloys La_1-xU_xRu_2Si_2 (x≤0.07) have been investigated by means of magnetic susceptibility x, magnetization m, specific heat C_p and electrical resistivity ρ measurements to clarify the single-U-site effects of URu_2Si_2. Local 5f electrons show a strong magnetic anisotropy along the tetragonal c axis, as is observed in other dilute alloys Th_1-xU_xRu_2Si_2 and Y_1-xU_xRu_2Si_2. As temperature is lowered below〜60 K,the c-axis susceptibility Xc follows a In T function,and ρ decreases in proportion to Xc. The 5f electronic specific heat C^5f_p/T exhibits a broad peak at〜10K. The entropy change associated with this anomaly below 30K is estimated to be only about 0.3R In 2. Although the local Fermi liquid behavior is observed in x, C_p and ρ at very low temperatures, the In T decrease in ρ and the small entropy change provide a remarkable contrast with those expected in the usual magnetic dilute alloys.
社団法人日本物理学会の論文
2002-12-15