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, Jun Akimitsu

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

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
Volume77
Issue number14
DOIs
Publication statusPublished - Apr 7 2008
Externally publishedYes

Fingerprint

x ray scattering
Superconductivity
inelastic scattering
superconductivity
Scattering
X rays
Lattice vibrations
Electrons
Linewidth
Superconducting materials
electrons
symmetry
room temperature
Temperature
Direction compound

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Soft-phonon-driven superconductivity in CaAlSi as seen by inelastic x-ray scattering. / Kuroiwa, S.; Baron, A. Q R; Muranaka, T.; Heid, R.; Bohnen, K. P.; Akimitsu, Jun.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 77, No. 14, 140503, 07.04.2008.

Research output: Contribution to journalArticle

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