As-NQR study of superconductivity in LaRAsO1-xFx (R=Fe and Ni)
文献类型：期刊论文
| 作者 | Oka, T ; Tabuchi, T ; Li, Z ; Kawasaki, S ; Chen, GF ; Luo, JL ; Wang, NL ; Zheng, GQ |
| 刊名 | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
 |
| 出版日期 | 2011 |
| 卷号 | 72期号:5页码:497 |
| 关键词 | SPIN FLUCTUATIONS NMR INSTABILITY COMPOUND GAPS CU |
| ISSN号 | 0022-3697 |
| 通讯作者 | Oka, T: Okayama Univ, Dept Phys, Okayama 7008530, Japan. |
| 中文摘要 | We report As-75 nuclear quadrupole resonance (NQR) studies on oxypnictide superconductors LaFeAsO1-xFx (x=0.08, 0.15) and LaNiAsO1-xFx (x=0, 0.06, 0.10, 0.12). In LaFeAsO0.92F0.08 (T-c=23 K), nuclear spin-lattice relaxation rate 1/T-1 shows no coherence peak just below T-c and decreases with decreasing temperature accompanied by a hump structure at T similar to 0.4T(c), which is a characteristic of the multigap superconductivity. In the normal state, the quantity 1/T1T increases with decreasing temperature to T-c, indicating that the existence of antiferromagnetic correlation originating from its multiple electronic band structure. On the other hand, LaNiAsO1-xFx shows a clear Hebel-Slichter (coherence) peak just below T-c, evidencing that the LaNiAsO1-xFx is a BCS superconductor. In the normal state, 1/T-1 T is constant in the temperature range 4 <= T <= 10 K for all LaNiAsO1-xFx, which indicates electron correlations are weak. We suggest that the contrasting behavior of both superconductivity and electron correlations in LaFeAsO0.92F0.08 and LaNiAsO1-xFx between them relate to the difference of electronic band structure configuration. We also provide a possible interpretation for the pseudogap-like behavior in the normal state observed in both compounds. (C) 2010 Elsevier Ltd. All rights reserved. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/33985]  |
| 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 | Oka, T,Tabuchi, T,Li, Z,et al. As-NQR study of superconductivity in LaRAsO1-xFx (R=Fe and Ni)[J]. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,2011,72(5):497. |
| APA | Oka, T.,Tabuchi, T.,Li, Z.,Kawasaki, S.,Chen, GF.,...&Zheng, GQ.(2011).As-NQR study of superconductivity in LaRAsO1-xFx (R=Fe and Ni).JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,72(5),497. |
| MLA | Oka, T,et al."As-NQR study of superconductivity in LaRAsO1-xFx (R=Fe and Ni)".JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 72.5(2011):497. |
入库方式： OAI收割
来源：物理研究所
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