Influence of microstructure on superconductivity in KxFe2 (-) Se-y(2) and evidence for a new parent phase K2Fe7Se8

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	Influence of microstructure on superconductivity in KxFe2 (-) Se-y(2) and evidence for a new parent phase K2Fe7Se8
	Ding, XX ; Fang, DL ; Wang, ZY ; Yang, H ; Liu, JZ ; Deng, Q ; Ma, GB ; Meng, C ; Hu, YH ; Wen, HH
刊名	NATURE COMMUNICATIONS
	2013
卷号	4
ISSN号	2041-1723
通讯作者	Wen, HH (reprint author), Nanjing Univ, Natl Ctr Microstruct & Quantum Manipulat, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China.
中文摘要	The search for new superconducting materials has been spurred on by the discovery of iron-based superconductors whose structure and composition is qualitatively different from the cuprates. The study of one such material, KxFe2 Se-y(2) with a critical temperature of 32 K, is made more difficult by the fact that it separates into two phases-a dominant antiferromagnetic insulating phase K2Fe4Se5, and a minority superconducting phase whose precise structure is as yet unclear. Here we perform electrical and magnetization measurements, scanning electron microscopy and microanalysis, X-ray diffraction and scanning tunnelling microscopy on KxFe2 (-) Se-y(2) crystals prepared under different quenching processes to better understand the relationship between its microstructure and its superconducting phase. We identify a three-dimensional network of superconducting filaments within this material and present evidence to suggest that the superconducting phase consists of a single Fe vacancy for every eight Fe-sites arranged in a root 8 X root 10 parallelogram structure.
资助信息	NSF of China [A0402/11034011, A0402/11190023]; Ministry of Science and Technology of China (973 projects) [2011CBA00100, 2012CB821403, 2012CB21400]; PAPD
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57110]
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	Ding, XX,Fang, DL,Wang, ZY,et al. Influence of microstructure on superconductivity in KxFe2 (-) Se-y(2) and evidence for a new parent phase K2Fe7Se8[J]. NATURE COMMUNICATIONS,2013,4.
APA	Ding, XX.,Fang, DL.,Wang, ZY.,Yang, H.,Liu, JZ.,...&Wen, HH.(2013).Influence of microstructure on superconductivity in KxFe2 (-) Se-y(2) and evidence for a new parent phase K2Fe7Se8.NATURE COMMUNICATIONS,4.
MLA	Ding, XX,et al."Influence of microstructure on superconductivity in KxFe2 (-) Se-y(2) and evidence for a new parent phase K2Fe7Se8".NATURE COMMUNICATIONS 4(2013).