J. Phys. Soc. Jpn. 73, pp. 2790-2794 (2004) [5 Pages]
FULL PAPERS

Lattice Constants, Electrical Resistivity and Specific Heat of RNiC2

+ Affiliations
1Department of Physics, Keio University, Yokohama 223-85222Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578

Anomalous temperature dependence of electrical resistivity was found to be ubiquitous among the compounds RNiC 2 with R = La, Ce, Nd, Sm, Gd, Tb and Er. Lattice parameters were also observed to exhibit anomalous temperature dependence for some of the compounds studied by X-ray diffraction. It is argued that the existence of charge modulated structures is the cause of the former anomalies. The latter anomalies, on the other hand, are likely to be related to the coupling between the lattice and the f-electrons. Results of heat capacity measurements are used to estimate crystal field levels in NdNiC 2 and SmNiC 2 .

©2004 The Physical Society of Japan

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