期刊
PHYSICAL REVIEW B
卷 85, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.024518
关键词
-
资金
- 973 program [2011CBA00112]
- NSF of China [11034012, 11004243]
- Fundamental Research Funds for Central Universities
- Renmin University
We have performed Raman-scattering measurements on a high-quality single crystal of the recently discovered Fe-based superconductor K0.8Fe1.6Se2 (T-c = 32 K). At least 13 phonon modes were observed in the wave number range 10-300 cm(-1). The spectra possess a fourfold symmetry indicative of bulk vacancy order in the Fe-deficient planes. We perform a vibration analysis based on first-principles calculations, which both confirms the ordered structure and allows a complete mode assignment. We observe an anomaly at T-c in the 180 cm(-1) A(g) mode, which indicates a rather specific type of electron-phonon coupling.
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