THE ROLE OF OXYGEN DEFECTS IN SUPERCONDUCTIVITY OF ND2-XCEXCUO4-Y STUDIED BY X-RAY ABSORPTION FINE-STRUCTURE

被引：9

作者：

OYANAGI, H

YOKOYAMA, Y

YAMAGUCHI, H

KATAYAMA, T

NISHIHARA, Y

KUWAHARA, Y

机构：

[1] Electrotechnical Laboratory, Tsukuba, Ibaraki, 305, Umezono

来源：

PHYSICA C | 1991年 / 185卷

关键词：

D O I：

10.1016/0921-4534(91)91644-J

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The role of oxygen defects in superconductivity and their effect on the electron states has been studied by X-ray absorption fine structure on the Cu K and Ce L3 edges, for Nd2-xCexCuO4-y (0.0 < x < 0.20) annealed at various oxygen partial pressures (pO2 = 1-10(-4) atm). The results indicate that the reduction enhances the electron density at the copper sites, without changing the oxygen deficiency y. A possible mechanism of carrier enhancement through the removal of a small number of excess oxygen atoms which would suppress n-type doping in the CuO2 plane is presented.

引用

页码：841 / 842

页数：2

共 2 条

[1] SYSTEMATIC VARIATION OF TRANSPORT AND THERMODYNAMIC PROPERTIES WITH DEGREE OF REDUCTION IN ND1.85CE0.15CUO4-DELTA [J].

FORTUNE, NA ;

MURATA, K ;

ISHIBASHI, M ;

YOKOYAMA, Y ;

NISHIHARA, Y .

PHYSICAL REVIEW B, 1991, 43 (16) :12930-12934

[2] ROLE OF OXYGEN IN SUPERCONDUCTIVITY OF ND2-XCEXCUO4-Y STUDIED BY X-RAY-ABSORPTION NEAR-EDGE STRUCTURE [J].

OYANAGI, H ;

YOKOYAMA, Y ;

YAMAGUCHI, H ;

KUWAHARA, Y ;

KATAYAMA, T ;

NISHIHARA, Y .

PHYSICAL REVIEW B, 1990, 42 (16) :10136-10140

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