CRYSTAL-CHEMISTRY OF BISMUTHATE-BASED SUPERCONDUCTORS - THE ORIGIN OF (LOCAL) CHARGE DISPROPORTIONATION

被引：28

作者：

FU, WT

机构：

[1] Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, 2300 RA Leiden

来源：

PHYSICA C | 1995年 / 250卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(95)00266-9

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The crystal structures of the superconducting BaPb1-xBixO3 and Ba1-xKxBiO3 systems are summarized and the role of lead or potassium substitution is discussed. It is pointed out that the metal-insulator transition in these systems can readily be explained with a model based on the competition between (conduction) bandwidth and charge disproportionation. In the context of this model, the origin of the charge disproportionation of Bi (whether long-range or local ordering of Bi3+ and Bi5+) can be understood. This qualitative model may also explain the negative results of other bismuth-doped systems, providing a useful test for experimental challenges.

引用

页码：67 / 74

页数：8

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