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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2002

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

Résumé

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.

Dates et versions

hal-00122382 , version 1 (30-12-2006)

Identifiants

Citer

S. Raymond, J. P. Rueff, M. d'Astuto, D. Braithwaite, M. Krisch, et al.. Phonon anomalies at the valence transition of SmS : An inelasticX-ray scattering study under pressure. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2002, 66, pp.220301. ⟨hal-00122382⟩
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