Journal
PHYSICAL REVIEW B
Volume 79, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.140510
Keywords
iron compounds; phonon spectra; Raman spectra; selenium compounds; soft modes
Funding
- National Basic Research Program of China [2006CB9213001, 2006CB601002]
- NSFC [10574064, 20673133]
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The polarized Raman-scattering spectra of nonsuperconducting alpha-FeTe and of As-free superconductor Fe1.03Se0.3Te0.7 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 Fe1.03Se0.3Te0.7, 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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