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

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

2008-11-14

arxiv.org/abs/0811.2350v2

Phys. Rev. B 79, 140510(R) (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 2 tables, 3 figures

Scientific paper

10.1103/PhysRevB.79.140510

The polarized Raman scattering spectra of nonsuperconducting $\alpha$-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 $\alpha$-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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