Abstract
We synthesized A Cu 3 Ru 4 O 12 ( A = Na, Na 0.5 Ca 0.5 , Ca, Ca 0.5 La 0.5 , La) and measured their DC magnetization, AC susceptibility, specific heat, and resistivity, in order to investigate the effects of the hetero-valent substitution. A broad peak in the DC magnetization around 200 K was observed only in CaCu 3 Ru 4 O 12 , suggesting the Kondo effect due to localized Cu 2+ ions. However, the electronic specific heat coefficients γ exhibit large values not only for CaCu 3 Ru 4 O 12 but also for all the other samples. Moreover, the Wilson ratio and the Kadowaki–Woods ratio of our samples are all similar to the values of other heavy-fermion compounds. These results question the Kondo effect as the dominant origin of the mass enhancement, and rather indicate the importance of correlations among itinerant Ru electrons.
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