ORBITAL STRUCTURE OF COPPER IN HIGH-TEMPERATURE SUPERCONDUCTORS

被引:17
作者
KHOMSKII, DI [1 ]
NEIMARK, EI [1 ]
机构
[1] PN LEBEDEV PHYS INST,MOSCOW,USSR
来源
PHYSICA C | 1991年 / 173卷 / 5-6期
关键词
D O I
10.1016/0921-4534(91)90734-G
中图分类号
O59 [应用物理学];
学科分类号
摘要
The orbital structure of copper ions in high-T(c) cuprates is discussed in a localized picture. Experimental indications that the d(z)2-orbital becomes relevant, especially at high doping levels, are summarized. The possible mechanism of this effect, notably the crossing of d(x)2-y2 and d(z)2-levels with doping, is identified and corresponding numerical calculations are carried out. It is shown that e.g. for La(2-x)Sr(x)CuO4 the crossing of these levels may occur at x approximately 0.4. The consequences of this phenomenon for the stability of the system and for its superconductivity are briefly discussed.
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收藏
页码:342 / 346
页数:5
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