Cu/Te substitution effects on superconductivity and microstructure of phase-separated K0.8Fe1.75Se2

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	Cu/Te substitution effects on superconductivity and microstructure of phase-separated K0.8Fe1.75Se2
	Wang, Z ; Cai, Y ; Wang, ZW ; Sun, ZA ; Yang, HX ; Tian, HF ; Ma, C ; Zhang, B ; Li, JQ
刊名	EPL
	2013
卷号	102 期号:3
ISSN号	0295-5075
通讯作者	Wang, Z (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	Two series of K0.8Fe1.75-xCuxSe2 (0 <= x <= 0.15) and K0.8Fe1.75Se2-yTey (0 <= y <= 0.5) single crystals of nominal composition have been prepared and their physical properties and microstructural features have been studied. Resistivity measurements demonstrate that the superconducting transition temperature decreases gradually with the increase of the substitution level and zero resistivity finally disappears in both systems. Systematic TEM, SEM and XRD structural analyses, in combination with the magnetic experimental data, reveal a rich variety of structural phenomena resulting from different types of substitution. Cu substitution gives rise to the volume of a new non-superconducting Cu-rich phase with modulation q(3) = 1/3[2a* + b] coexisting with the q(2) = 1/2[a + b*] superconducting stripe domain. With the increase of the ratio of the new non-superconducting phase along with doping, the superconducting path is finally cut off, and results in the absence of zero resistivity. In contrast, the absence of superconductivity in Te-substituted materials is correlated with the complete disappearance of the q2 superconducting phase due to the suppression of phase separation. Copyright (C) EPLA, 2013
资助信息	National Basic Research Program of China 973 Program [2011CBA00101, 2010CB923002, 2011CB921703, 2012CB821404]; Natural Science Foundation of China [11274368, 51272277, 11074292, 11004229, 11190022, 51171055]; Chinese Academy of Sciences
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/311004/56860]
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, Z,Cai, Y,Wang, ZW,et al. Cu/Te substitution effects on superconductivity and microstructure of phase-separated K0.8Fe1.75Se2[J]. EPL,2013,102(3).
APA	Wang, Z.,Cai, Y.,Wang, ZW.,Sun, ZA.,Yang, HX.,...&Li, JQ.(2013).Cu/Te substitution effects on superconductivity and microstructure of phase-separated K0.8Fe1.75Se2.EPL,102(3).
MLA	Wang, Z,et al."Cu/Te substitution effects on superconductivity and microstructure of phase-separated K0.8Fe1.75Se2".EPL 102.3(2013).