Optical study of the spin-density-wave properties of single-crystalline Na1-delta FeAs

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	Optical study of the spin-density-wave properties of single-crystalline Na1-delta FeAs
	Hu, WZ ; Li, G ; Zheng, P ; Chen, GF ; Luo, JL ; Wang, NL
刊名	PHYSICAL REVIEW B
	2009
卷号	80 期号:10
关键词	FE-BASED SUPERCONDUCTORS GAP
ISSN号	1098-0121
通讯作者	Hu, WZ (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	A series of new Sr2-xBaxCuO3+delta (0 < x < 0.6) superconductors were prepared using high-pressure and high-temperature synthesis. A Rietveld refinement based on powder x-ray diffraction confirms that the superconductors crystallize in the K2NiF4-type structure of a space group I4/mmm similar to that of La2CuO4 but with partially occupied apical oxygen sites. It is found that the superconducting transition temperature T-c of this Ba substituted Sr2CuO3+delta superconductor with constant carrier-doping level, i.e., constant delta is controlled not only by order/disorder of apical-O atoms but also by Ba content. T-c(max)=98 K is achieved in the material with x=0.6 that reaches the record value of T-c among the single-layer copper oxide superconductors and is higher than T-c=95 K of Sr2CuO3+delta with optimally ordered apical-O atoms. There is Sr-site disorder in Sr2-xBaxCuO3+delta which might lead to a reduction in T-c. The result indicates that another effect surpasses the disorder effect that is related either to the increased in-plane Cu-O bond length or to elongated apical-O distance due to Ba substitution with larger cation size. The present experiment demonstrates that the optimization of local geometry out of the Cu-O plane can dramatically enhance T-c in the cuprate superconductors.
收录类别	SCI
资助信息	NSFC; CAS; 973 project of the MOST of China
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/50369]
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	Hu, WZ,Li, G,Zheng, P,et al. Optical study of the spin-density-wave properties of single-crystalline Na1-delta FeAs[J]. PHYSICAL REVIEW B,2009,80(10).
APA	Hu, WZ,Li, G,Zheng, P,Chen, GF,Luo, JL,&Wang, NL.(2009).Optical study of the spin-density-wave properties of single-crystalline Na1-delta FeAs.PHYSICAL REVIEW B,80(10).
MLA	Hu, WZ,et al."Optical study of the spin-density-wave properties of single-crystalline Na1-delta FeAs".PHYSICAL REVIEW B 80.10(2009).