Soft-phonon-driven superconductivity in CaAlSi as seen by inelastic x-ray scattering

Details Soft-phonon-driven superconductivity in CaAlSi as seen by inelastic x-ray scattering Soft-phonon-driven superconductivity in CaAlSi as seen by inelastic x-ray scattering

2008-02-20

arxiv.org/abs/0802.2765v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, to be published in Phys. Rev. B (Rapid Communications)

Scientific paper

10.1103/PhysRevB.77.140503

Inelastic x-ray scattering and $ab$-$initio$ calculation are applied to investigate the lattice dynamics and electron-phonon coupling of the ternary silicide superconductor CaAlSi ($P/bar{6}m2$). A soft c-axis polarized mode is clearly observed along the $/Gamma$-$A$-$L$ symmetry directions. The soft mode is strongly anharmonically broadened at room temperature, but, at 10 K, its linewidth narrows and becomes in good agreement with calculations of linear electron-phonon coupling. This establishes a coherent description of the detailed phonon properties in this system and links them clearly and consistently with the superconductivity.

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