Grain geometry effect on the magnetic properties of a granular iron-based superconductor LaFeAsO1-xFx
文献类型：期刊论文
| 作者 | Polichetti, M ; Zola, D ; Luo, JL ; Chen, GF ; Li, Z ; Wang, NL ; Noce, C ; Pace, S |
| 刊名 | SUPERCONDUCTOR SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2012 |
| 卷号 | 25期号:2 |
| 关键词 | AC-SUSCEPTIBILITY MEASUREMENTS HIGH-TEMPERATURE SUPERCONDUCTORS SINGLE-CRYSTALS HARMONIC SUSCEPTIBILITIES BULK SUPERCONDUCTORS FLUX DYNAMICS FIELD YBA2CU3O7-DELTA FILMS BARRIER |
| ISSN号 | 0953-2048 |
| 通讯作者 | Polichetti, M: Univ Salerno, Dipartimento Fis ER Caianiello, Via Ponte Don Melillo, I-84084 Fisciano, SA, Italy. |
| 中文摘要 | We have studied and compared the magnetic response of LaFeAsO0.92F0.08, in the form of granular bulk and powder, to the application of ac magnetic fields with different frequencies. The study of the third harmonics of the ac susceptibility has shown that the ac frequency plays an important role in the electromagnetic coupling of the grains in the granular sample. In particular, the characteristic harmonic response of the bulk sample at the highest frequency resembles the response of the unconnected grains of the powders, even at low frequencies. Moreover, the possibility of the occurrence of magnetic field focusing in the region between the grains, ascribed to both superconducting shielding and geometric effect of the grains, has been considered to explain the observed peak effect in the dc magnetization loops on the bulk sample. Although our investigation has be confined to the LaFeAsO0.92F0.08 granular, these results may be applied to any granular sample consisting of flat grains connected by weak links. Moreover, they also show that a peak effect in a granular superconductor can exist without necessarily invoke the existence of vortex dynamic processes. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/38804]  |
| 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 | Polichetti, M,Zola, D,Luo, JL,et al. Grain geometry effect on the magnetic properties of a granular iron-based superconductor LaFeAsO1-xFx[J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY,2012,25(2). |
| APA | Polichetti, M.,Zola, D.,Luo, JL.,Chen, GF.,Li, Z.,...&Pace, S.(2012).Grain geometry effect on the magnetic properties of a granular iron-based superconductor LaFeAsO1-xFx.SUPERCONDUCTOR SCIENCE & TECHNOLOGY,25(2). |
| MLA | Polichetti, M,et al."Grain geometry effect on the magnetic properties of a granular iron-based superconductor LaFeAsO1-xFx".SUPERCONDUCTOR SCIENCE & TECHNOLOGY 25.2(2012). |
入库方式： OAI收割
来源：物理研究所
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