Vacancy ordering and phonon spectrum of the iron-based superconductor K0.8Fe1.6Se2
Vacancy ordering and phonon spectrum of the iron-based superconductor K0.8Fe1.6Se2
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铁基超导体K0.8Fe1.6Se2的空位有序性和声子谱
DOI：
10.1103/physrevb.85.024518
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发表时间：
2011-01
影响因子：
3.7
通讯作者：
Zhang, Q. M.
中科院分区：
文献类型：
--
作者：
Zhang, A. M.;Liu, K.;Xiao, J. H.;He, J. B.;Wang, D. M.;Chen, G. F.;Norm;, B.;Zhang, Q. M.
我们对最近发现的铁基超导体K_（0.8）Fe_（1.6）Se_2（Tc = 32 K）的高质量单晶进行了拉曼散射测量。在10-300 cm（-1）波数范围内，至少观察到13个声子模。该光谱具有四重对称性，表明在铁缺乏的平面散装空缺秩序。我们进行振动分析的基础上的第一性原理计算，这既确认了有序的结构，并允许一个完整的模式分配。我们在180 cm（-1）A（g）模中观察到Tc处的异常，这表明了一种相当特殊的电子-声子耦合类型。
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.
影响因子：
64.8
作者：
C. Raman
通讯作者：
C. Raman