Temperature dependence of the elastic constants in the valence fluctuation compound of SmB6 and the reference one of LaB6 has been investigated by an ultrasonic method. The DC sputtering technique of a piezoelectric ZnO film on SmB6 has been employed for a reliable ultrasonic measurement free from bond breaks. A remarkable softening of the bulk modulus CB and an anomaly of the C44 mode in SmB6 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.
ASJC Scopus subject areas
- Physics and Astronomy(all)