Role of oxygen in superconductivity of Nd2-xCexCuO4-y studied by x-ray-absorption near-edge structure.
Role of oxygen in superconductivity of Nd2-xCexCuO4-y studied by x-ray-absorption near-edge structure.
复制标题
通过 X 射线吸收近边缘结构研究氧在 Nd2-xCexCuO4-y 超导性中的作用。
DOI：
10.1103/physrevb.42.10136
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Nishihara
中科院分区：
文献类型：
--
作者：
Oyanagi;Yokoyama;Yamaguchi;Kuwahara;Katayama;Nishihara
The effect of reduction on the electron states of Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4{minus}{ital y}} (0.15{lt}{ital x}{lt}0.17) has been revealed by x-ray-absorption near-edge structure on the Cu {ital K} edge for a series of samples annealed at various oxygen partial pressures ({ital p}O{sub 2}=1--10{sup {minus}3} atm). We find that the Ce doping-induced states in the near-edge structure systematically increase the magnitude with the decrease of oxygen partial pressure, well correlating with the oxygen pressure dependence of superconducting fraction and {Tc} value. The results indicate that the reduction strongly enhances the electron density at the copper sites, through the removal of a small number of defect oxygen atoms that suppress {ital n}-type doping in the CuO{sub 2} plane.
The effect of reduction on the electron states of Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4{minus}{ital y}} (0.15{lt}{ital x}{lt}0.17) has been revealed by x-ray-absorption near-edge structure on the Cu {ital K} edge for a series of samples annealed at various oxygen partial pressures ({ital p}O{sub 2}=1--10{sup {minus}3} atm). We find that the Ce doping-induced states in the near-edge structure systematically increase the magnitude with the decrease of oxygen partial pressure, well correlating with the oxygen pressure dependence of superconducting fraction and {Tc} value. The results indicate that the reduction strongly enhances the electron density at the copper sites, through the removal of a small number of defect oxygen atoms that suppress {ital n}-type doping in the CuO{sub 2} plane.