Effect of iron content and potassium substitution in A(0.8)Fe(1.6)Se(2) (A=K, Rb, Tl) superconductors: A Raman scattering investigation
文献类型：期刊论文
| 作者 | Zhang, AM ; Liu, K ; He, JB ; Wang, DM ; Chen, GF ; Normand, B ; Zhang, QM |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2012 |
| 卷号 | 86期号:13 |
| 关键词 | AUGMENTED-WAVE METHOD PHASE-SEPARATION ORDER FESE |
| ISSN号 | 1098-0121 |
| 通讯作者 | Zhang, AM (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China. |
| 中文摘要 | We have performed Raman-scattering measurements on high-quality single crystals of the superconductors K0.8Fe1.6Se2 (T-c = 32 K), Tl0.5K0.3Fe1.6Se2 (T-c = 29 K), and Tl0.5Rb0.3Fe1.6Se2 (T-c = 31 K) as well as of the insulating compound KFe1.5Se2. To interpret our results, we have made first-principles calculations for the phonon modes in the ordered iron-vacancy structure of K0.8Fe1.6Se2. The modes we observe can be assigned very well from our symmetry analysis and calculations, allowing us to compare Raman-active phonons in the AFeSe compounds. We find a clear frequency difference in most phonon modes between the superconducting and nonsuperconducting potassium crystals, indicating the fundamental influence of iron content. By contrast, substitution of K by Tl or Rb in A(0.8)Fe(1.6)Se(2) causes no substantial frequency shift for any modes above 60 cm(-1), demonstrating that the alkali-type metal has little effect on the microstructure of the FeSe layer. Several additional modes appear below 60 cm(-1) in Tl- and Rb-substituted samples, which are vibrations of heavier Tl and Rb ions. Finally, our calculations reveal the presence of "chiral" phonon modes, whose origin lies in the chiral nature of the K0.8Fe1.6Se2 structure. |
| 收录类别 | SCI |
| 资助信息 | 973 program of the MoST of China [2011CBA00112, 2012CB921701]; NSF of China [11034012, 11174367, 11004243]; Fundamental Research Funds for Central Universities; Research Funds of Renmin University of China (RUC) |
| 语种 | 英语 |
| 公开日期 | 2014-02-20 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/57802]  |
| 专题 | 物理研究所_所内人员在其他单位发表论文题录信息_所内人员在其他单位发表论文题录信息_期刊论文 |
| 推荐引用方式 GB/T 7714 | Zhang, AM,Liu, K,He, JB,et al. Effect of iron content and potassium substitution in A(0.8)Fe(1.6)Se(2) (A=K, Rb, Tl) superconductors: A Raman scattering investigation[J]. PHYSICAL REVIEW B,2012,86(13). |
| APA | Zhang, AM.,Liu, K.,He, JB.,Wang, DM.,Chen, GF.,...&Zhang, QM.(2012).Effect of iron content and potassium substitution in A(0.8)Fe(1.6)Se(2) (A=K, Rb, Tl) superconductors: A Raman scattering investigation.PHYSICAL REVIEW B,86(13). |
| MLA | Zhang, AM,et al."Effect of iron content and potassium substitution in A(0.8)Fe(1.6)Se(2) (A=K, Rb, Tl) superconductors: A Raman scattering investigation".PHYSICAL REVIEW B 86.13(2012). |
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来源：物理研究所
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