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

Vibrational modes in silicon clathrate compounds : a key to understanding superconductivity

Résumé

Several doped type-I silicon clathrates (Na8@Si46, K8@Si46, Ba8@Si46 and I8@Si46) have been investigated both experimentally by inelastic neutron scattering and x-ray-absorption spectroscopy and theoretically by ab initio calculations. We find that Ba atoms have a stronger coupling with the host lattice than Na or K ones. We show that in the superconductor Ba8@Si46 the coupling is effectively done by host acoustic phonons exciting guest acoustic modes. These features suggest that the host-guest vibrational coupling is a crucial parameter to explain the appearance of superconductivity in addition to the density of states near the Fermi level.

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Matériaux
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hal-00717021 , version 1 (18-12-2023)

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Edouard Reny, Alfonso San Miguel, Yannick Guyot, Bruno Masenelli, Patrice Mélinon, et al.. Vibrational modes in silicon clathrate compounds : a key to understanding superconductivity. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2002, 66 (1), 014532 (7 p.). ⟨10.1103/PhysRevB.66.014532⟩. ⟨hal-00717021⟩
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