Role of oxygen nonstoichiometry and the reduction process on the local structure of Nd2-xCexCuO4±δ -: art. no. 064513

被引：44

作者：

Richard, P ^{[1
]}

Riou, G ^{[1
]}

Hetel, I ^{[1
]}

Jandl, S ^{[1
]}

Poirier, M ^{[1
]}

Fournier, P ^{[1
]}

机构：

[1] Univ Sherbrooke, Dept Phys, Regroupement Quebecois Mat Pointe, Sherbrooke, PQ J1K 2R1, Canada

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 06期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevB.70.064513

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report Raman and crystal-field infrared transmission studies of Nd2-xCexCuO4 single crystals. Nd3+ crystal-field excitations from the ground state to excited multiplets are detected. While the Nd3+ regular site is almost not perturbed by Ce-doping and oxygen nonstoichiometry, oxygen vacancies in O(1) and O(2) sites, as well as apical oxygen, are detected. The type of oxygen vacancies created is found to be Ce-doping dependent, with the reduction of the optimally doped samples involving only CuO2 plane O(1) oxygen vacancies. In contrast to the widespread belief, the apical oxygen is not removed by the reduction of as-grown samples.

引用

页码：064513 / 1

页数：7

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