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arXiv 0709.1179cond-mat.supr-con
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超导体CaC6中声子的非弹性X射线散射研究

Inelastic X-ray Scattering Study of Phonons in Superconducting CaC6

M. H. Upton, A. C. Walters, C. A. Howard, K. C. Rahnejat, M. Ellerby, J. P. Hill, D. F. McMorrow, A. Alatas, Bogdan M. Leu, Wei Ku

摘要:

我们利用非弹性X射线散射研究了最近发现的超导体CaC 6中的声子的色散和温度依赖性。观察到四个[00 L]和两个ab面声子模,并在高于和低于T_c的温度下测量到。在一般情况下,我们的声子色散的测量与现有的声子色散的理论计算是很好的协议。鉴于声子导出量的实验测量与理论计算之间的若干差异,这是显著的。目前的工作表明,这些差异的根源在于对这种材料中电子-声子耦合的理解,而不是声子本身。

英文摘要:

We investigate the dispersion and temperature dependence of a number of phonons in the recently discovered superconductor CaC6 utilizing inelastic x-ray scattering. Four [00L] and two ab-plane phonon modes are observed, and measured at temperatures both above and below T_c. In general, our measurements of phonon dispersions are in good agreement with existing theoretical calculations of the phonon dispersion. This is significant in light of several discrepancies between experimental measurements of phonon-derived quantities and theoretical calculations. The present work suggests that the origin of these discrepancies lies in the understanding of the electron-phonon coupling in this material, rather than in the phonons themselves.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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