Correlation-Induced Self-Doping in the Iron-Pnictide Superconductor Ba2Ti2Fe2As4O
文献类型：期刊论文
| 作者 | Ma, JZ ; van Roekeghem, A ; Richard, P ; Liu, ZH ; Miao, H ; Zeng, LK ; Xu, N ; Shi, M ; Cao, C ; He, JB ; Chen, GF ; Sun, YL ; Cao, GH ; Wang, SC ; Biermann, S ; Qian, T ; Ding, H |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2014 |
| 卷号 | 113期号:26 |
| ISSN号 | 0031-9007 |
| 通讯作者 | Ma, JZ (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China. |
| 中文摘要 | The electronic structure of the iron-based superconductor Ba2Ti2Fe2As4O (T-c(onset) = 23.5 K) has been investigated by using angle-resolved photoemission spectroscopy and combined local density approximation and dynamical mean field theory calculations. The electronic states near the Fermi level are dominated by both the Fe 3d and Ti 3d orbitals, indicating that the spacer layers separating different FeAs layers are also metallic. By counting the enclosed volumes of the Fermi surface sheets, we observe a large self-doping effect; i.e., 0.25 electrons per unit cell are transferred from the FeAs layer to the Ti2As2O layer, leaving the FeAs layer in a hole-doped state. This exotic behavior is successfully reproduced by our dynamical mean field calculations, in which the self-doping effect is attributed to the electronic correlations in the 3d shells. Our work provides an alternative route of effective doping without element substitution for iron-based superconductors. |
| 资助信息 | MOST of China [2010CB923000, 2013CB921700, 2011CBA001000]; NSFC [11474340, 11234 014, 11274362]; CAS [XDB07000000]; Cai Yuanpei program; French ANR via project PNICTIDES; IDRIS/GENCI [091393]; European Research Council [617196]; Sino-Swiss Science and Technology Cooperation [IZLCZ2138954]; University of Wisconsin-Madison |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/59579]  |
| 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 | Ma, JZ,van Roekeghem, A,Richard, P,et al. Correlation-Induced Self-Doping in the Iron-Pnictide Superconductor Ba2Ti2Fe2As4O[J]. PHYSICAL REVIEW LETTERS,2014,113(26). |
| APA | Ma, JZ.,van Roekeghem, A.,Richard, P.,Liu, ZH.,Miao, H.,...&Ding, H.(2014).Correlation-Induced Self-Doping in the Iron-Pnictide Superconductor Ba2Ti2Fe2As4O.PHYSICAL REVIEW LETTERS,113(26). |
| MLA | Ma, JZ,et al."Correlation-Induced Self-Doping in the Iron-Pnictide Superconductor Ba2Ti2Fe2As4O".PHYSICAL REVIEW LETTERS 113.26(2014). |
入库方式： OAI收割
来源：物理研究所
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