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arXiv 0811.2350cond-mat.supr-con
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$α$和Fe $_{1.03}$ Se $_{0.3}$ Te $_{0.7}$单晶的拉曼声子

Raman phonons of $α$-FeTe and Fe$_{1.03}$Se$_{0.3}$Te$_{0.7}$ single crystals

Tian-Long Xia, D. Hou, S. C. Zhao, A. M. Zhang, G. F. Chen, J. L. Luo, N. L. Wang, J. H. Wei, Z. -Y. Lu, Q. M. Zhang

摘要:

在室温下测量了非超导的$α$-FeTe和新发现的无As超导体Fe $_{1.03}$ Se $_{0.3}$ Te $_{0.7}$的偏振喇曼散射光谱。通过对称性分析和第一性原理计算相结合,对声子模进行了归属。在母体化合物$α$-FeTe中,可以清楚地观察到Te原子的A $_{1g}$模和Fe原子的B $_{1g}$模,而在超导体Fe $_{1.03}$ Se $_{0.3}$ Te $_{0.7}$中,只能观察到软化的Fe B $_{1g}$模.在两种样品的光谱中没有发现电子-声子耦合的特征。相比之下,超导系统的光谱显示出低于300 $cm^{-1}$的轻微增强,这可能是电子起源的。

英文摘要:

The polarized Raman scattering spectra of nonsuperconducting $α$-FeTe and of the newly discovered, As-free superconductor Fe$_{1.03}$Se$_{0.3}$Te$_{0.7}$ are measured at room temperature on single crystals. The phonon modes are assigned by combining symmetry analysis with first-principles calculations. In the parent compound $α$-FeTe, the A$_{1g}$ mode of the Te atom and the B$_{1g}$ mode of the Fe atom are observed clearly, while in superconducting Fe$_{1.03}$Se$_{0.3}$Te$_{0.7}$, only a softened Fe B$_{1g}$ mode can be seen. No electron-phonon coupling feature can be distinguished in the spectra of the two samples. By contrast, the spectra of the superconducting system show a slight enhancement below 300$cm^{-1}$, which may be of electronic origin.

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