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YBa_2-xM_xCu₃O_7-δ（M=Ca,Sr）的晶体结构与超导电性

CRYSTAL STRUCTURE AND SUPERCONDUCTIVITY ON YBa_2-xM_xCu₃O_7-δ（M=Ca,Sr）

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【Author】 Cheng Xiangai He Zhenhui Zhang Han Zhou Xianyi Wang Shunxi Xia Jiangsheng Fang Minghu Zhang Qirui(Department of Physics,University of Science and Technology of China,Hefei,230026; Department of Physics,Beijing University,100871;International Center for Materials Science,Academia Sinica,Shenyang,110015; Department of Physics,Zhejiang University,Hangzhou,310027)

【机构】中国科学技术大学物理系；北京大学物理系；中国科学院国际材料物理中心；浙江大学物理系；浙江大学物理系合肥； 230026；合肥； 100871；沈阳； 110015；杭州； 310027； 310027；

【摘要】通过对正交单相 YBa_2-xM_xCu₃O_7-δ（M=Ca,x=0.05,0.1,0.25;M=Sr,x=0.1,1.0）样品的晶格参数、超导电性、氧含量以及 Hall 系数的测量,发现随着替代元素含量的增加,体系氧含量基本不变,正交化程度减弱,四方化程度增强,Cu-O 面上的载流子浓度减少,超导中点转变温度（T_c）呈下降的趋势.分析表明,四方化程度增强与局域结构扭曲密切相关;Cu-O 面上的载流子浓度对高 T_c 的超导电性影响很大.更多还原

【Abstract】 The crystal structure,superconductivity,oxygen content and Hall coefficient have been investigated for the single phase YBa2-xMxCu3O7-δ(M=Ca,Sr) samples with orthorhombic structure.We find that with the increase of the content of the substituted element,the oxygen con-tent remains almost unchanged,the orthorhombic weekends,the tetragonal enhances,the carrier concentration on the Cu-O planes decreases and the mid-point transition temperature Tc drops gradually.We conclude that there exist a relationship between the stronger and stronger tetragonal and local structure distortion,and that the carrier concentration on the Cu-O planes has an important effect on high Tc superconductivity.更多还原