Abstract
In YbB 6, the elastic constants and specific heat were measured. Both results give different features from those of LaB 6: no softening of C 12 and more softened flat low frequency Yb modes, due to the lack of the metallic bonds. Phonon dispersion curves of LaB 6 and YbB 6 are calculated theoretically. In LaB 6, a small value of C 12 is explained by the volume-dependent force acting on La atoms and the calculated phonon dispersion curves are in good agreement with the measured ones. In YbB 6, too, the calculated phonon dispersion curves agree with the experimental results. The origin of the volume-dependent long range forces is considered.
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