Multiple gaps in SmFeAsO0.9F0.1 revealed by point-contact spectroscopy

CORC > 物理研究所 > 物理所公开发表论文 > 期刊论文

	Multiple gaps in SmFeAsO0.9F0.1 revealed by point-contact spectroscopy
	Wang, YL ; Shan, L ; Fang, L ; Cheng, P ; Ren, C ; Wen, HH
刊名	SUPERCONDUCTOR SCIENCE & TECHNOLOGY
	2009
卷号	22 期号:1
关键词	LAYERED SUPERCONDUCTOR LAO0.9F0.1-DELTA-FEAS IRON-BASED SUPERCONDUCTORS QUATERNARY COMPOUND MAGNETIC-FIELDS TRANSITION MODEL
ISSN号	0953-2048
通讯作者	Wang, YL: Chinese Acad Sci, Inst Phys, Natl Lab Superconduct, Natl Lab Superconduct, POB 603, Beijing 100190, Peoples R China.
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	Ministry of Science and Technology of China [2006CB601000, 2006CB921802, 2006CB921300]; Chinese Academy of Sciences [ITSNEM]
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/42402]
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	Wang, YL,Shan, L,Fang, L,et al. Multiple gaps in SmFeAsO0.9F0.1 revealed by point-contact spectroscopy[J]. SUPERCONDUCTOR SCIENCE & TECHNOLOGY,2009,22(1).
APA	Wang, YL,Shan, L,Fang, L,Cheng, P,Ren, C,&Wen, HH.(2009).Multiple gaps in SmFeAsO0.9F0.1 revealed by point-contact spectroscopy.SUPERCONDUCTOR SCIENCE & TECHNOLOGY,22(1).
MLA	Wang, YL,et al."Multiple gaps in SmFeAsO0.9F0.1 revealed by point-contact spectroscopy".SUPERCONDUCTOR SCIENCE & TECHNOLOGY 22.1(2009).