Temperature dependence of the elastic constants in the valence fluctuation compound of SmB 6 and the reference one of LaB 6 has been investigated by an ultrasonic method. The DC sputtering technique of a piezoelectric ZnO film on SmB 6 has been employed for a reliable ultrasonic measurement free from bond breaks. A remarkable softening of the bulk modulus C B and an anomaly of the C 44 mode in SmB 6 are responsible for the interaction between the elastic strain and the narrow 4f-band state with the energy gap of 160 K around the Fermi level.
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Nakamura et al. (1991) studied this question.
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