Effect of doping on structural and superconducting properties in Ca1-xNaxFe2As2 single crystals (x=0.5, 0.6, 0.75)
文献类型：期刊论文
| 作者 | Haberkorn, N ; Maiorov, B ; Jaime, M ; Usov, I ; Miura, M ; Chen, GF ; Yu, W ; Civale, L |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2011 |
| 卷号 | 84期号:6 |
| 关键词 | HIGH-TEMPERATURE SUPERCONDUCTORS COATED CONDUCTORS II SUPERCONDUCTORS PINNING MECHANISMS CURRENT DENSITIES MAGNETIC-FIELDS THIN-FILMS YBA2CU3O7 |
| ISSN号 | 1098-0121 |
| 通讯作者 | Haberkorn, N (reprint author), Los Alamos Natl Lab, MPA STC, POB 1663, Los Alamos, NM 87545 USA. |
| 中文摘要 | We study the correlation between crystalline structure and superconducting properties in Na-doped Ca1-xNaxFe2As2 single crystals for three chemical compositions (x = 0.5, 0.6, 0.75). We find the maximum superconducting transition temperature T-c similar to 33.4 K at x similar to 0.75. The Na substitution causes the decrease of the a-b crystallographic axes and the increase of the c axis in the tetragonal phase. The single crystals show perfect diamagnetism, indicating full superconducting volume. The anisotropy ratio for the upper critical field near the superconducting transition temperature is gamma = 1.85 +/- 0.05, independently of the Na content. A narrow vortex liquid phase was detected in the sample with highest T-c (x = 0.75), consistent with the expectations based on a Lindemann criterion. The analysis of the critical currents shows no evidence of correlated pinning and indicates that the pinning arises from a combination of several mechanisms. At low fields, pinning by random nanoparticles dominates. At higher fields, a small and field independent J(c) in the optimally doped crystal may originate in the simultaneous presence of sparse large nanoparticles and a much denser distribution of smaller particles, with the sparse pins producing a caging effect that constrains the volume of the vortex bundle associated with the denser and weaker defects. |
| 收录类别 | SCI |
| 资助信息 | US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering; NSF-DMR [0654118]; DOE; State of Florida (National High Magnetic Field Laboratory - Pulsed Field Facility at LANL); NSFC [10974254, 11074304]; National Basic Research Program of China [2010CB923000, 2011CBA00100] |
| 语种 | 英语 |
| 公开日期 | 2014-02-20 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/57807]  |
| 专题 | 物理研究所_所内人员在其他单位发表论文题录信息_所内人员在其他单位发表论文题录信息_期刊论文 |
| 推荐引用方式 GB/T 7714 | Haberkorn, N,Maiorov, B,Jaime, M,et al. Effect of doping on structural and superconducting properties in Ca1-xNaxFe2As2 single crystals (x=0.5, 0.6, 0.75)[J]. PHYSICAL REVIEW B,2011,84(6). |
| APA | Haberkorn, N.,Maiorov, B.,Jaime, M.,Usov, I.,Miura, M.,...&Civale, L.(2011).Effect of doping on structural and superconducting properties in Ca1-xNaxFe2As2 single crystals (x=0.5, 0.6, 0.75).PHYSICAL REVIEW B,84(6). |
| MLA | Haberkorn, N,et al."Effect of doping on structural and superconducting properties in Ca1-xNaxFe2As2 single crystals (x=0.5, 0.6, 0.75)".PHYSICAL REVIEW B 84.6(2011). |
入库方式： OAI收割
来源：物理研究所
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