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

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

2002-04-19

arxiv.org/abs/cond-mat/0204429v1

Phys. Rev. B 66 (2002) 220301(R)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.66.220301

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 ($\frac{2\pi}{3a},\frac{2\pi}{3a},\frac{2\pi}{3a}$) 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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