| Y1-xPrxBa2Cu3O7-δ体系中的离子价键特性与超导电性 |
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| 引用本文： | 张小俊,王劲松,许祝安,张其瑞. Y1-xPrxBa2Cu3O7-δ体系中的离子价键特性与超导电性[J]. 物理学报, 1993, 42(12): 1985-1989 |
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| 作者姓名： | 张小俊 王劲松 许祝安 张其瑞 |
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| 作者单位： | 浙江大学物理系,杭州310027 |
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| 摘 要： | 基于中子散射实验结果,应用键价计算方法研究了Y1-xPrxBa2Cu3O7-δ(x=0,0.2,0.4,0.6)体系中离子的价键特性。对Cu(1),Cu(2)及Y(Pr)的键价和计算结果表明,Cu(2)的键价和与超导临界温度(Tc)之间存在着强烈的关朕。在氧含量基本保持不变的情况下,随Pr含量的增加,体系中电荷分布发生改变,Cu(1),Cu(2)的键价和下降,Y(Pr)的键价关键词：
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| 关 键 词： | 超导体 化学键 键价 临界温度 |
| 收稿时间： | 1992-12-29 |
BOND VALENCE CHARACTER AND SUPERCONDUCTIVITY IN Y1-xPrxBa2Cu3O7-δ SYSTEM |
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| ZHANG XIAO-JUN,WANG JIN-SONG,XU ZHU-AN and ZHANG QI-RUI. BOND VALENCE CHARACTER AND SUPERCONDUCTIVITY IN Y1-xPrxBa2Cu3O7-δ SYSTEM[J]. Acta Physica Sinica, 1993, 42(12): 1985-1989 |
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| Authors: | ZHANG XIAO-JUN WANG JIN-SONG XU ZHU-AN ZHANG QI-RUI |
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| Abstract: | Based on data of neutron diffraction measurements, the oxidation states in Y1-xPrxBa2Cu3O7-δ system are determined by bond valence sums (BVS) calculation. It is found that a close correlation between the BVS value of Cu(2) and superconducting critical temperature (Tc) exists. We believe that the increase of Pr content leads to the variation of charge distribution when the content of oxygen remains almost constant. At the same time ,the BVS value of Cu(l) and Cu(2) decreases,while that of Y(Pr) increases,and the holes in CuO2 plane are partly localized in Pr-O bond. The quenching of superconductivity by Pr ions is mainly attributed to this localization of the holes in CuO2 plane by Pr ions. |
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