XANES study of rare-earth valency and 4f hybridization in Pb(2)Sr(2)Ln(1-x)Ca(x)Cu(3)O(8) for Ln=Ce, Pr and Tb

被引:13
作者
Pedersen, KR [1 ]
Jorgensen, JE [1 ]
机构
[1] AARHUS UNIV,DEPT CHEM,DK-8000 AARHUS C,DENMARK
来源
PHYSICA C | 1996年 / 264卷 / 3-4期
关键词
D O I
10.1016/0921-4534(96)00263-8
中图分类号
O59 [应用物理学];
学科分类号
摘要
Pb2Sr2Ce0.5Ca0.5Cu3O8 and Pb(2)Sr(2)Ln(1-x)Ca(x)Cu(3)O(8) with Ln = Pr, To and x = 0.0 and 0.5 have been studied by rare-earth L(II,III) edge XANES spectroscopy. The spectra of Pb2Sr2Ce0.5Ca0.5Cu3O8 show that Ca doping of Pb2Sr2CeCu3O8 causes a partial oxidation of Ce. Analysis within the framework of the Anderson single-impurity model yields an f electron occupation of 0.5 in Pb2Sr2Ce0.5Ca0.5Cu3O8. The partial oxidation of Ce in Pb2Sr2Ce0.5Ca0.5Cu3O8 prevents the formation of electron holes in the CuO2 layers and thereby explains the lack of superconductivity in this compound. The XANES spectra of the Pr and Tb containing compounds show that the rare-earth ions in these compounds are trivalent and that no oxidation of the rare-earth ions is induced by Ca doping.
引用
收藏
页码:185 / 190
页数:6
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