Phase separation, competition, and volume-fraction control in NaFe1-xCoxAs
文献类型：期刊论文
| 作者 | Ma, L ; Dai, J ; Wang, PS ; Lu, XR ; Song, Y ; Zhang, CL ; Tan, GT ; Dai, PC ; Hu, D ; Li, SL ; Normand, B ; Yu, WQ |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2014 |
| 卷号 | 90期号:14 |
| ISSN号 | 1098-0121 |
| 通讯作者 | Yu, WQ (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China. |
| 中文摘要 | We report a detailed nuclear magnetic resonance (NMR) study by combined Na-23 and As-75 measurements over a broad range of doping to map the phase diagram of NaFe1-xCoxAs. In the underdoped regime (x <= 0.017), we find a magnetic phase with robust antiferromagnetic (AFM) order, which we denote the s-AFM phase, cohabiting with a phase of weak and possibly proximity-induced AFM order (w-AFM) whose volume fraction V similar or equal to 8% is approximately constant. Near optimal doping, at x = 0.0175, we observe a phase separation between static antiferromagnetism related to the s-AFM phase and a paramagnetic (PM) phase related to w-AFM. The volume fraction of AFM phase increases upon cooling, but both the Neel temperature and the volume fraction can be suppressed systematically by applying a c-axis magnetic field. On cooling below T-c, superconductivity occupies the PM region and its volume fraction grows at the expense of the AFM phase, demonstrating a phase separation of the two types of order based on volume exclusion. At higher dopings, static antiferromagnetism and even critical AFM fluctuations are completely suppressed by superconductivity. Thus the phase diagram we establish contains two distinct types of phase separation and reflects a strong competition between AFM and superconducting phases both in real space and in momentum space. We suggest that both this strict mutual exclusion and the robustness of superconductivity against magnetism are consequences of the extreme two-dimensionality of NaFeAs. |
| 资助信息 | National Basic Research Program of China [2010CB923004, 2011CBA00112, 2012CB921704]; NSF of China [11174365, 11222433, 11374364]; US DOE Office of Basic Energy Sciences [DE-SC0012311, DE-FG02-08ER46528] |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/59503]  |
| 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, L,Dai, J,Wang, PS,et al. Phase separation, competition, and volume-fraction control in NaFe1-xCoxAs[J]. PHYSICAL REVIEW B,2014,90(14). |
| APA | Ma, L.,Dai, J.,Wang, PS.,Lu, XR.,Song, Y.,...&Yu, WQ.(2014).Phase separation, competition, and volume-fraction control in NaFe1-xCoxAs.PHYSICAL REVIEW B,90(14). |
| MLA | Ma, L,et al."Phase separation, competition, and volume-fraction control in NaFe1-xCoxAs".PHYSICAL REVIEW B 90.14(2014). |
入库方式： OAI收割
来源：物理研究所
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