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
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DOI：
10.1103/physrevb.77.140503
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发表时间：
2008-04-01
影响因子：
3.7
通讯作者：
Akimitsu, J.
中科院分区：
文献类型：
--
作者：
Kuroiwa, S.;Baron, A. Q. R.;Akimitsu, J.
应用非弹性 X 射线散射和从头计算来研究三元硅化物超导体 CaAlSi (P (6) over bar m2) 的晶格动力学和电子声子耦合。沿 Gamma-A-L 对称方向清晰地观察到软 c 轴偏振模式。软模式在室温下强烈非谐波展宽，但在 10 K 时，其线宽变窄，与线性电子声子耦合的计算结果非常一致。这在该系统中建立了详细声子特性的连贯描述，并将它们与超导性清晰一致地联系起来。
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 (6) over bar 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 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.