THE RELATIONSHIP BETWEEN BOND-VALENCE SUMS AND TC IN CUPRATE SUPERCONDUCTORS

被引:140
作者
TALLON, JL
机构
[1] Physics and Engineering Laboratory, DSIR, Lower Hutt
来源
PHYSICA C | 1990年 / 168卷 / 1-2期
关键词
D O I
10.1016/0921-4534(90)90107-P
中图分类号
O59 [应用物理学];
学科分类号
摘要
The recently demonstrated correlation of Tc with copper or oxygen bond valence sums for a wide range of superconducting cuprates is shown to contradict the behaviour observed for YBa2CU3Ox as x is varied from 6 to 7. This conflict is removed by introducing two independent variables, namely, the sum of and difference of the copper and oxygen bond valence sums. The latter is a measure of the hole density on the CuO2 plane and as this increases Tc passes through a maximum Tc (max). The former indicates the relative distribution of these holes on the oxygen or copper sites for a given compound. Tc(max) correlates closely with the preference for hole distribution on the oxygen atoms. A general phase-diagram using these bond sum parameters is presented. © 1990.
引用
收藏
页码:85 / 90
页数:6
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