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Low Temperature Properties of the Ce_{1-x}La_{x}NiAl_4

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Toliński T., Kowalczyk A., Reiffers M., Šebek J., Šantavá E., Curlik I., Ilkovič S.

issue 5

933-935

Measurements of the heat capacity in ultralow temperatures (down to 350 mK) have been carried out for Ce_{1-x}La_{x}NiAl_4. The paramagnetic behavior above about 30 K can be well described by the Curie-Weiss magnetic susceptibility. The undoped CeNiAl_4 compound is a known heavy fermion system with a large electronic specific heat coefficient (γ = 0.5 J mol^{-1} K^{-2}) and the Kondo temperature in the range 30-80 K. In the case of the Ce_{0.8}La_{0.2}NiAl_4 and Ce_{0.6}La_{0.4}NiAl_4 compounds a peak in C/T appears below 2 K, which is strongly damped by the magnetic field. It is probably connected with the Kondo and/or magnetic interactions and the electronic specific heat coefficient is 0.19 J mol^{-1} K^{-2} (0.43 J mol^{-1} K^{-2}) for x = 0.2 (x = 0.4) at T → 0. The value determined above the peak, at temperature for which the magnetic field starts to decrease γ ( ≈ 3 K), is about 0.5 J mol^{-1} K^{-2} and the effect of the magnetic field can be well analyzed in frames of the single-ion Kondo model.

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1 Acta Physica Polonica A

1 2010

1 Curlik I.

1 Ilkovič S.

1 Kowalczyk A.

1 Reiffers M.

1 Toliński T.

1 Šantavá E.

1 Šebek J.

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Low Temperature Properties of the Ce_{1-x}La_{x}NiAl_4