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Oxygen defects in Fe-substituted Tl-system superconductors
作者姓名:李阳  曹国辉  王耘波  马庆珠  熊小涛  陈宁  马如璋  郭应焕  许祝安  王劲松  张小俊  焦正宽  彭获田  周思海
作者单位:Department of Materials Physice,University of Science and Technology Beijng,Beijng 100083,National Laboratory for Superconductivity,Chinese Academy of Sciences,Beijng 100080,China,National Laboratory for Superconductivity,Chinese Academy of Beijing 100080 China,National Laboratory for Superconductivity,Chinese Academy of Beijing 100080 China,International Center for Materials Physics,Chinese Academy of Sciences,Shenyang 110015,China,International Center for Materials Physics,Chinese Academy of Sciences,Shenyang 110015,China,International Center for Materials Physics,Chinese Academy of Sciences,Shenyang 110015,China,International Center for Materials Physics,Chinese Academy of Sciences,Shenyang 110015,China,National Laboratory of Nuclear Technology,Chinese Academy of Sciences,Beijing 100080,China,Department of Physics,Zhejiang University,Hangzhou 310027,China,Department of Physics,Zhejiang University,Hangzhou 310027,China,Department of Physics,Zhejiang University,Hangzhou 310027,China,Department of Physics,Zhejiang University,Hangzhou 310027,China,Changsha Research Institute of Mining and Metallurgy,Changsha 410012,China,Changsha Research Institute of Mining and Metallurgy,Changsha 410012,China
基金项目:Project supported in part by the National Center for Research and Development on Superconductivity and National Laboratory of Nuclear Technology.
摘    要:For Fe-doped T1-1223 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 Tco 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 microstructure


Oxygen defects in Fe-substituted Tl-system superconductors
LI Yang CAO Guohui WANG YunboMA Qingzhu XIONG Xiaotao CHEN NingMA Ruzhang.Oxygen defects in Fe-substituted Tl-system superconductors[J].Science in China(Technological Sciences),1996(1).
Authors:LI Yang CAO Guohui WANG YunboMA Qingzhu XIONG Xiaotao CHEN NingMA Ruzhang
Abstract:For Fe-doped T1-1223 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 Tco 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.
Keywords:Tl-system superconductors  Fe-doping effect  extra oxygen defect  carrier density  
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