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

S. Kuroiwa, A. Q.R. Baron, T. Muranaka, R. Heid, K. P. Bohnen, J. Akimitsu

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


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 6̄ m2). A soft c -axis polarized mode is clearly observed along the Γ-A-L symmetry directions. The soft mode is strongly anharmonically broadened at room temperature, but at 10 K, its linewidth narrows and comes in good agreement with calculations of linear electron-phonon coupling. This establishes a coherent description of the detailed phonon properties into this system and links them clearly and consistently with the superconductivity.

Original languageEnglish
Article number140503
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
Publication statusPublished - Apr 7 2008
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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