Structural evolution of Ce(1-x)Gd(x)FeAsO(0.84)F(0.16) superconductors

IMR OpenIR

	Structural evolution of Ce(1-x)Gd(x)FeAsO(0.84)F(0.16) superconductors
	J. L. Yang; W. J. Ren; D. Li; Z. D. Zhang
	2011
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	109 期号:7
摘要	Structural parameters have a critical impact on superconductivity in iron-based oxypnictide superconductors. Structural evolution study was performed on Ce(1-x)Gd(x)FeAsO(0.84)F(0.16) superconductors by the analysis of the x-ray diffraction patterns with Rietveld refinement. Substitution of Gd for Ce generates internal pressure that compresses the crystal lattice. The contraction of the c axis is also indicated by the reduction of Ce/Gd-As and Ce/Gd-O/F distances, while there is a slight increase in the As-Fe-As block size, which is compensated by a large reduction in the Ce/Gd-O/F-Ce/Gd block with Gd substitution. The diagonal Fe-As-Fe angle for Ce(0.6)Gd(0.4)FeAsO(0.84)F(0.16), with the highest T(c) among Ce(1-x)Gd(x)FeAsO(0.84)F(0.16) compounds, is 111.13 degrees. It is close to the ideal value of 109.47 degrees for the perfect FeAs tetrahedron, which is situated in the region of Fe-As-Fe bond angles where RFeAsO compounds tend to have the highest T(c). (C) 2011 American Institute of Physics. [doi:10.1063/1.3565408]
部门归属	[ren, w. j.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;ren, wj (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china;wjren@imr.ac.cn
关键词	Layered Quaternary Compound High-temperature Superconductivity
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30822
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. L. Yang,W. J. Ren,D. Li,et al. Structural evolution of Ce(1-x)Gd(x)FeAsO(0.84)F(0.16) superconductors[J]. Journal of Applied Physics,2011,109(7).
APA	J. L. Yang,W. J. Ren,D. Li,&Z. D. Zhang.(2011).Structural evolution of Ce(1-x)Gd(x)FeAsO(0.84)F(0.16) superconductors.Journal of Applied Physics,109(7).
MLA	J. L. Yang,et al."Structural evolution of Ce(1-x)Gd(x)FeAsO(0.84)F(0.16) superconductors".Journal of Applied Physics 109.7(2011).