Measurement of an Enhanced Superconducting Phase and a Pronounced Anisotropy of the Energy Gap of a Strained FeSe Single Layer in FeSe/Nb:SrTiO3/KTaO3 Heterostructures Using Photoemission Spectroscopy
文献类型：期刊论文
| 作者 | Peng, R ; Shen, XP ; Xie, X ; Xu, HC ; Tan, SY ; Xia, M ; Zhang, T ; Cao, HY ; Gong, XG ; Hu, JP ; Xie, BP ; Feng, DL |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2014 |
| 卷号 | 112期号:10 |
| ISSN号 | 0031-9007 |
| 通讯作者 | Peng, R (reprint author), Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China. |
| 中文摘要 | Single-layer FeSe films with an extremely expanded in-plane lattice constant of 3.99 +/- 0.02 angstrom are fabricated by epitaxially growing FeSe/Nb:SrTiO3/KTaO3 heterostructures and studied by in situ angle-resolved photoemission spectroscopy. Two elliptical electron pockets at the Brillouin zone corner are resolved with negligible hybridization between them, indicating that the symmetry of the low-energy electronic structure remains intact as a freestanding single-layer FeSe, although it is on a substrate. The superconducting gap closes at a record high temperature of 70 K for the iron-based superconductors. Intriguingly, the superconducting gap distribution is anisotropic but nodeless around the electron pockets, with minima at the crossings of the two pockets. Our results place strong constraints on current theories. |
| 资助信息 | National Science Foundation of China; National Basic Research Program of China (973 Program) [2012CB921402] |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/59588]  |
| 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 | Peng, R,Shen, XP,Xie, X,et al. Measurement of an Enhanced Superconducting Phase and a Pronounced Anisotropy of the Energy Gap of a Strained FeSe Single Layer in FeSe/Nb:SrTiO3/KTaO3 Heterostructures Using Photoemission Spectroscopy[J]. PHYSICAL REVIEW LETTERS,2014,112(10). |
| APA | Peng, R.,Shen, XP.,Xie, X.,Xu, HC.,Tan, SY.,...&Feng, DL.(2014).Measurement of an Enhanced Superconducting Phase and a Pronounced Anisotropy of the Energy Gap of a Strained FeSe Single Layer in FeSe/Nb:SrTiO3/KTaO3 Heterostructures Using Photoemission Spectroscopy.PHYSICAL REVIEW LETTERS,112(10). |
| MLA | Peng, R,et al."Measurement of an Enhanced Superconducting Phase and a Pronounced Anisotropy of the Energy Gap of a Strained FeSe Single Layer in FeSe/Nb:SrTiO3/KTaO3 Heterostructures Using Photoemission Spectroscopy".PHYSICAL REVIEW LETTERS 112.10(2014). |
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来源：物理研究所
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