Structural phase transition below 250 K in superconducting K0.75Fe1.75Se2
文献类型：期刊论文
| 作者 | Ignatov, A ; Kumar, A ; Lubik, P ; Yuan, RH ; Guo, WT ; Wang, NL ; Rabe, K ; Blumberg, G |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2012 |
| 卷号 | 86期号:13 |
| 关键词 | PSEUDOPOTENTIALS SEPARATION PHONONS ORDER |
| ISSN号 | 1098-0121 |
| 通讯作者 | Ignatov, A (reprint author), Rutgers State Univ, Dept Phys & Astron, POB 849, Piscataway, NJ 08854 USA. |
| 中文摘要 | Vibrational properties of iron-chalcogenide superconductor K0.75Fe1.75Se2 with T-c similar to 30 K have been measured by Raman and optical spectroscopies over the temperature range 3-300 K. The sample undergoes I4/m -> I4 structural phase transition accompanied by loss of inversion symmetry at T-1, below 250 K, observed as the appearance of new fully symmetric Raman mode at similar to 165 cm(-1). Small vibration mode anomalies are also observed at T-2 similar to 160 K. From first-principles vibrational analysis of antiferromagnetic K0.8Fe1.6Se2 utilizing pseudopotentials all observed Raman and infrared modes have been assigned and the displacement patterns of the new Raman mode identified as involving predominantly the Se atoms. |
| 收录类别 | SCI |
| 资助信息 | US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0005463]; NSFC; 973 projects of MOST [2011CB921701, 2012CB821403] |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/53324]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Ignatov, A,Kumar, A,Lubik, P,et al. Structural phase transition below 250 K in superconducting K0.75Fe1.75Se2[J]. PHYSICAL REVIEW B,2012,86(13). |
| APA | Ignatov, A.,Kumar, A.,Lubik, P.,Yuan, RH.,Guo, WT.,...&Blumberg, G.(2012).Structural phase transition below 250 K in superconducting K0.75Fe1.75Se2.PHYSICAL REVIEW B,86(13). |
| MLA | Ignatov, A,et al."Structural phase transition below 250 K in superconducting K0.75Fe1.75Se2".PHYSICAL REVIEW B 86.13(2012). |
入库方式： OAI收割
来源：物理研究所
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