Abstract
The new ternary compound CeCu5Au is derived from the heavy-fermion system CeCu6 by replacing the Cu(2) site by Au. Measurements of the dc magnetization, the specific heat, the magnetocaloric effect, and the electrical resistivity on Czochralski-grown single crystals reveal a complex (B, T) phase diagram with probably two antiferromagnetic phases and one spin-flop phase. The Néel temperature was determined toT n = 2.3 K. The magneto-resistance exhibits several features which can partly be explained by the different antiferromagnetic phases. In addition to the antiferromagnetic order the observation of a large specific heat at very low temperatures (γ = C/T = 0.64 J/molK2 at T = 0.1 K) indicates the coexistence of antiferro-magnetism and Kondo compensation. An analysis of the specific heat using the resonance-level model yields a Kondo temperature ofT k = 1.8 K. The analysis for lower fields is complicated by the presence of magnetic order. In terms of a homogeneous model,T k = 1.0 K forB = 0 is inferred. The increase ofT k with field and also the concentration dependence ofT K can be qualitatively explained.
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Paschke, C., Speck, C., Portisch, G. et al. Magnetic ordering and Kondo compensation in the ternary heavy-fermion compound CeCu5Au. J Low Temp Phys 97, 229–250 (1994). https://doi.org/10.1007/BF00752917
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DOI: https://doi.org/10.1007/BF00752917