Combined microstructural and magneto-optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides | |
Kametani, F ; Polyanskii, AA ; Yamamoto, A ; Jiang, J ; Hellstrom, EE ; Gurevich, A ; Larbalestier, DC ; Ren, ZA ; Yang, J ; Dong, XL ; Lu, W ; Zhao, ZX | |
刊名 | SUPERCONDUCTOR SCIENCE & TECHNOLOGY |
2009 | |
卷号 | 22期号:1 |
关键词 | LAYERED QUATERNARY COMPOUND SUPERCONDUCTIVITY CONDUCTORS MGB2 |
ISSN号 | 0953-2048 |
通讯作者 | Kametani, F: Florida State Univ, Ctr Appl Superconduct, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA. |
中文摘要 | In order to understand why the inter- and intra-granular current densities of polycrystalline superconducting oxypnictides differ by three orders of magnitude, we have conducted combined magneto-optical and microstructural examinations of representative randomly oriented polycrystalline Nd and Sm single-layer oxypnictides. Magneto-optical images show that the highest J(c) values are observed within single grains oriented with their c axes perpendicular to the observation plane, implying that the intragranular current is anisotropic. The much lower intergranular J(c) is at least partially due to many extrinsic factors, because cracks and a ubiquitous wetting As-Fe phase are found at many grain boundaries. However, some grain boundaries are structurally clean under high resolution transmission electron microscopy examination. Because the whole-sample global J(c) (5 K) values of the two samples examined are 1000-4000 A cm(-2), some 10-40 times higher than that found in random polycrystalline YBa(2)Cu(3)O(7-x), it appears that the dominant obstruction to intergranular current flow of many present samples is extrinsic, though some intrinsic limitation of current flow across grain boundaries cannot yet be ruled out. |
收录类别 | SCI |
资助信息 | NSF [227000-520-003597-5063, DMR-0084173, DMR-0514592]; State of Florida; DOE; AFOSR [FA9550-06-10474] |
语种 | 英语 |
公开日期 | 2013-09-17 |
内容类型 | 期刊论文 |
源URL | [http://ir.iphy.ac.cn/handle/311004/34876] |
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 | Kametani, F,Polyanskii, AA,Yamamoto, A,et al. Combined microstructural and magneto-optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides[J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY,2009,22(1). |
APA | Kametani, F.,Polyanskii, AA.,Yamamoto, A.,Jiang, J.,Hellstrom, EE.,...&Zhao, ZX.(2009).Combined microstructural and magneto-optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides.SUPERCONDUCTOR SCIENCE & TECHNOLOGY,22(1). |
MLA | Kametani, F,et al."Combined microstructural and magneto-optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides".SUPERCONDUCTOR SCIENCE & TECHNOLOGY 22.1(2009). |
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