Crystal-field excitations in the heavy-fermion alloys CeCu6−x Au x studied by specific heat and inelastic neutron scattering |
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Authors: | B. Stroka A. Schröder T. Trappmann H. v. Löhneysen M. Loewenhaupt A. Severing |
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Affiliation: | (1) Physikalisches Institut, Universität Karlsruhe, W-7500 Karlsruhe, Federal Republic of Germany;(2) Institut für Festkörperforschung, Forschungszentrum Jülich, W-5170 Jülich, Federal Republic of Germany;(3) Institut Laue-Langevin, F-38042 Grenoble, France |
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Abstract: | The specific heat of CeCu6–xAux withx=0,0.3, and 0.9, and of the corresponding La homologues has been measured between 1.5 K and 150 K. With increasingx we find progressively better-defined Schottky anomalies arising from the crystal-field splitting, which is attributed to the decrease of the Kondo temperature. Both observations are in line with the results of inelastic neutron-scattering data performed on samples withx=0.5. Overall, the crystal-field splitting does not change very much upon alloying with Au. A detailed analysis shows that forx=0.5 the quasielastic line width is smaller and the inelastic crystal-field transitions are better resolved compared to CeCu6. |
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