Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies
文献类型：期刊论文
| 作者 | Gao, PW ; Yu, R ; Sun, LL ; Wang, HD ; Wang, Z ; Wu, Q ; Fang, MH ; Chen, GF ; Guo, J ; Zhang, C ; Gu, DC ; Tian, HF ; Li, JQ ; Liu, J ; Li, YC ; Li, XD ; Jiang, S ; Yang, K ; Li, AG ; Si, QM ; Zhao, ZX |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2014 |
| 卷号 | 89期号:9 |
| 关键词 | INSULATOR CHALCOGENIDES PNICTIDES |
| ISSN号 | 1098-0121 |
| 通讯作者 | llsun@iphy.ac.cn ; zhxzhao@iphy.ac.cn |
| 英文摘要 | There is considerable interest in uncovering the physics of iron-based superconductivity from the alkaline iron selenides, a materials class containing an insulating phase (245 phase) and a superconducting (SC) phase. Due to the microstructural complexity of these superconductors, the role of the 245 phase in the development of the superconductivity has been a puzzle. Here we demonstrate a comprehensive high-pressure study on the insulating samples with pure 245 phase and biphasic SC samples. We find that the insulating behavior can be completely suppressed by pressure in the insulating samples and also identify an intermediate metallic (M similar to) state. The Mott insulating (MI) state of the 245 phase and the M' state coexist over a significant range of pressure up to similar to 10 GPa, the same pressure at which the superconductivity of the SC samples vanishes. Our results reveal the M' state as a pathway that connects the insulating and SC phases of the alkaline iron selenides and indicate that the coexistence and interplay between the MI and M' states is a necessary condition for superconductivity. Finally, we interpret the M' state in terms of an orbital selectivity of the correlated 3d electrons. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000332704400003 |
| 公开日期 | 2015-03-13 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/14367]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 推荐引用方式 GB/T 7714 | Gao, PW,Yu, R,Sun, LL,et al. Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies[J]. PHYSICAL REVIEW B,2014,89(9). |
| APA | Gao, PW.,Yu, R.,Sun, LL.,Wang, HD.,Wang, Z.,...&Zhao, ZX.(2014).Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies.PHYSICAL REVIEW B,89(9). |
| MLA | Gao, PW,et al."Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies".PHYSICAL REVIEW B 89.9(2014). |
入库方式： OAI收割
来源：上海应用物理研究所
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