2008/02/29 by S. Kuroiwa, Alfred Q. R. Baron, A. Q. R. Baron +6
Materials Science · Physics and Astronomy · #Condensed matter physics #Coupling (piping) #Dielectric #Inelastic neutron scattering #Inelastic scattering #Iron-based superconductors research #Lattice (music) #Materials science #Phonon #Physics #Quantum mechanics #Rare-earth and actinide compounds #Scattering #Soft modes #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.77.140503
4 pages, 4 figures, to be published in Phys. Rev. B (Rapid Communications)
arxiv created 2008/03/18 · openalex publication_date 2008/04/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 (P6m2). A soft c-axis polarized mode is clearly observed along the \ensuremathΓ\text\ensuremath-A\text\ensuremath-L symmetry directions. The soft mode is strongly anharmonically broadened at room temperature, but at 10\phantom\rule0.3em0exK, 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.