Oxygen defects in Fe-substituted Tl-system superconductors

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	Oxygen defects in Fe-substituted Tl-system superconductors
	Y. Li; G. H. Cao; Y. B. Wang; Q. Z. Ma; X. T. Xiong; N. Chen; R. Z. Ma; Y. H. Guo; Z. A. Xu; J. S. Wang; X. J. Zhang; Z. K. Jiao; H. T. Peng; S. H. Zhou
	1996
发表期刊	Science in China Series E-Technological Sciences
ISSN	1006-9321
卷号	39 期号:1 页码:76-83
摘要	For Fe-doped Tl-1223 phase, the excess oxygen defects induced by Fe dopants are studied by means of Hall coefficient, thermogravimetric measurements, Mossbauer spectroscopy, and the model calculation of the effective bond valence. The extra oxygen defects have effects on carrier density and microstructure of the superconductors. In the light doping level of Fe (x=0-0.05), the superconducting transition and carrier density have significant corresponding relation- the zero resistance temperature T-co and carrier densities decrease linearly with Fe dopants increasing. The thermogravimetric measurements show that the Fe3+ ions' substituting for Cu2+ ions can bring the extra oxygen into the lattice to form extra oxygen defects. The calculation of the effective bond valence shows that the decrease of carrier density originates the strongly localized binding of the extra oxygen defects. The distortion of Cu-O layer induced by the extra oxygen defects decreases the superconductive transition temperature. The microstructures of the extra oxygen defects including the oxygen occupying and the shifts of Fe and O are discussed.
部门归属	chinese acad sci,natl lab nucl technol,beijing 100080,peoples r china. zhejiang univ,dept phys,hangzhou 310027,peoples r china. changsha res inst min & met,changsha 410012,peoples r china. chinese acad sci,int ctr mat phys,shenyang 110015,peoples r china.
关键词	Tl-system Superconductors Fe-doping Effect Extra Oxygen Defect Carrier Density Oxides Tc
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WOS记录号	WOS:A1996WB00700009
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38326
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Li,G. H. Cao,Y. B. Wang,et al. Oxygen defects in Fe-substituted Tl-system superconductors[J]. Science in China Series E-Technological Sciences,1996,39(1):76-83.
APA	Y. Li.,G. H. Cao.,Y. B. Wang.,Q. Z. Ma.,X. T. Xiong.,...&S. H. Zhou.(1996).Oxygen defects in Fe-substituted Tl-system superconductors.Science in China Series E-Technological Sciences,39(1),76-83.
MLA	Y. Li,et al."Oxygen defects in Fe-substituted Tl-system superconductors".Science in China Series E-Technological Sciences 39.1(1996):76-83.