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Heat Capacity of Heavy Fermion Compound CeCu_4Ga in High Magnetic Fields

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Kowalczyk A., Toliński T., Reiffers M., Zapotoková M., Falkowski M., Gažo E.

Acta Physica Polonica A

2009

vol. 115

issue 1

123-125

The heat capacity in the applied magnetic field up to 9 T, susceptibility and magnetization of polycrystalline CeCu_{4}Ga are presented. Magnetic ordering was not observed down to 2 K. For temperature T < 200 K a Curie-Weiss behavior is observable giving an effective magnetic moment μ_{eff} =2.53 μ_{B}/f.u. The experimental value of μ_{eff} is close to the calculated one for a free Ce^{3+} ion (μ_{eff} = 2.54 μ_{B}/f.u.), thus indicating the presence of well localized magnetic moments carried by the stable Ce^{3+} ions. At low temperatures the electronic heat capacity coefficient value depends strongly on the temperature range used for the extrapolation and applied magnetic field. We observe a typical heavy fermion behavior with γ value of about 380 mJ mol^{-1} K^{-2} obtained from extrapolation to T = 0 K of the temperature range above 7 K. However, extrapolation of the lowest temperatures range yields the γ value of 3.3 J mol^{-1} K^{-2}.

Heat Capacity Studies of NdNi_4Si Compound

100%

Falkowski M., Reiffers M., Zapotoková M., Kowalczyk A., Toliński T., Gažo E.

Acta Physica Polonica A

2009

vol. 115

issue 1

126-128

The study of the heat capacity of the intermetallic compound NdNi_{4}Si including the effect of the magnetic field is reported. This compound crystallizes in the hexagonal CaCu_5-type structure, space group P6/mmm. NdNi_{4}Si is ferromagnetic with T_C = 8 K and the saturation magnetic moment of 1.5 μ_{B}/f.u. at 4.2 K (in H = 9 T). The heat capacity was analyzed considering the electronic contribution, the Schottky anomaly, and the lattice contributions in the frames of the Debye model. The scheme of the energy levels created by the crystal electric field split is determined from the Schottky contribution to the specific heat. NdNi_{4}Si was characterized by the electronic heat capacity coefficient γ = 85 mJ/(mol K^2) and the Debye temperature Θp_D = 325 K.

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2 Acta Physica Polonica A

2 2009

2 Falkowski M.

2 Gažo E.

2 Kowalczyk A.

2 Reiffers M.

2 Toliński T.

2 Zapotoková M.

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Heat Capacity of Heavy Fermion Compound CeCu_4Ga in High Magnetic Fields

Heat Capacity Studies of NdNi_4Si Compound