中华医学超声杂志

应用化学 ›› 1993, Vol. 0 ›› Issue (4): 26-29.

• 研究论文 • 上一篇    下一篇

VB族元素掺杂对YBa2Cu3O7-y电子结构的影响

孟建, 任玉芳, 李晓光   

  1. 中国科学院长春应用化学研究所稀土化学与物理开放实验室 130022 长春
  • 收稿日期:1992-08-20 修回日期:1992-12-11 出版日期:1993-08-10 发布日期:1993-08-10
  • 基金资助:
    国家自然科学基金;国家科委资助项目

EFFECT OF DOPED V B ELEMENTS ON ELECTRONIC STRUCTURE OF YBa2Cu3O7-y

Meng Jian, Ren Yufang, Li Xiaoguang   

  1. Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun
  • Received:1992-08-20 Revised:1992-12-11 Published:1993-08-10 Online:1993-08-10

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摘要： 合成了YBa2Cu3-xMxO7-y(M=V,Nb,Ta;x=0.0～0.7)高温超导体。X-射线粉末衍射分析表明,x≤0.6时,体系仍然是正交结构,没有发生正交到四方的相变。体系的晶胞参数随x的不同而异。体系的电阻率和Hall系数随x的增加而逐渐增加,它们的载流子浓度和载流子迁移率却随x的增加而下降。这说明VB族元素的置換影响了YBa2Cu3O7-y的电子结构。用晶体场理论对体系的电子结构作了解释。

关键词: 钇, 钒, 铌, 钽, 超导体, 电子结构

Abstract: Superconductors of type YBa2Cu3-xMxO7-y(My=V,Nb,Ta;x=0.0～0.7) have been prepared. No phase-transition from orthorhombie to tetragonal for x≤0.6 were found by X-ray diffractometry. The lattice parameters of the system vary with the number of x. The D.C. resistivities and the values of Hall effect measured at room temperature showed a progressive increase, but the concentration and the mobility of the carrier decreased gradually with the increase of x. This reveals that the partial substitution by the element of the V B group affects the electronic structure of the superconductor. The change of the electronic structure has been discussed in terms of the crystal field theory.

Key words: yttrium, vanadium, niobium, tantalum, superconductor, electronic structure

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