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The phonon dispersion curve of SmS under pressure was studied by inelasticx-ray scattering around the pressure-induced valence transition. A significantsoftening of the longitudinal acoustic modes propagating along the [111]direction was observed spanning a wide $q$ region from($\frac{2\pi}{3a},\frac{2\pi}{3a},\frac{2\pi}{3a}$) up to the zone boundary asSmS becomes metallic. The largest softening occurs at the zone boundary andstays stable up to the highest measured pressure of 80 kbar while a gradualhardening of the low $q$ modes simultaneously appears. This phonon spectrumindicates favorable conditions for the emergence of pressure-inducedsuperconductivity in SmS.Comment: 4 pages, 3 figure

Phonon anomalies at the valence transition of SmS: An inelastic x-ray-scattering study under pressure