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
DOI 10.1103/PhysRevB.77.140503 · Physical Review B
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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 (P6¯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 10K, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.5 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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