Phonon anomalies at the valence transition of SmS : An inelasticX-ray scattering study under pressure
S. Raymond, J. P. Rueff, M. D'Astuto, D. Braithwaite, M. Krisch, J. Flouquet
Abstract
The phonon dispersion curve of SmS under pressure was studied by inelastic x-ray scattering around the pressure-induced valence transition. A significant softening of the longitudinal acoustic modes propagating along the [111] direction was observed spanning a wide q region from (2π3a,2π3a,2π3a) up to the zone boundary as SmS becomes metallic. The largest softening occurs at the zone boundary and stays stable up to the highest measured pressure of 80 kbar while a gradual hardening of the low q modes simultaneously appears. This phonon spectrum indicates favorable conditions for the emergence of pressure-induced superconductivity in SmS.
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