J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981International Conference on Phonon Physics
|Page(s)||C6-14 - C6-16|
J. Phys. Colloques 42 (1981) C6-14-C6-16
PHONON SOFTENING IN INTERMEDIATE VALENT SmB6I. Mörke et P. Wachter
Laboratorium für Festkörperphysik, ETH Zürich, 8093 Zürich, Switzerland
We have measured the Raman spectrum of a SmB6 single crystal and compared it to LaB6 and EuB6. Beside the three high energy Raman active phonons we found additional excitations in these compounds. Most prominent is a peak at 172 cm-1 for SmB6, 214 cm-1 for LaB6 and 220 cm-1 for EuB6. The spectra are analysed in terms of defect induced phonon scattering. The softening of the line in intermediate valent (IV) SmB6 is explained in analogy with the phonon anomalies found in other IV compounds.