Low-Temperature Properties in Dilute Quadrupolar Compound Pr_xLa_<1-x>InAg_2(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

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The low-temperature properties of Pr_xLa_<1-x>InAg_2 have been studied for a wide concentration range of Pr ions between 0≤x≤0.6. The susceptibility above T=15K is well reproduced by the crystalelectric-field level scheme with a non-Kramers Γ_3 doublet in the ground state for each concentration, while that below T=15K shows a non-Fermi-liquid behavior with a logarithmic temperature dependence. The temperature dependence of the specific heat C/T shows a monotonic enhancement below T=10K, which can be scaled by a characteristic temperature T^* defined at each concentration. These results suggest that the anomalous low-temperature properties are understood as the single-ion nature of Γ_3 quadrupolar moments. The origin of the anomalous properties is discussed in connection with the quadrupolar Kondo effect arising from the correlation between the Γ_3 moments and the conduction electrons.
社団法人日本物理学会の論文
2005-08-15