Abstract
Recently, we have investigated magnetic properties of the 4f - and 5f -electron intermetallic compounds crystallizing in structures, which are characterized by two nonequivalent crystallographic sites for magnetic atoms [1, 2]. Of these compounds, remarkably Ce5CuSn3 adopting the hexagonal Ga4Ti5-type structure (space group P63/mcm) [3], orders antiferromagnetically below TN � 3.5 K and exhibits a moderate heavy-fermion behaviour with the electronic specific heat coefficient of 570 mJ/K 2 mol Ce at 2 K and 270 mJ/K 2 mol Ce above TN [2]. This fact gains special interest within the study of the competitive Ruderman-Kittel-Kasuya-Yosida (RRKY) and Kondo interactions. To study the formation of the heavy-fermion state in the presence of different exchange parameters, we have undertaken an investigation of solid solutions Ce5 xLaxCuSn3 by measurements of magnetization, electrical resistivity, thermoelectric power and heat-capacity. In this paper, we focus on the data of CeLa4CuSn3, where one suspects a dominating role of a single-ion Kondo effect.
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