Valence of Pr in Y0.8Pr0.2Ba2Cu3O7 and PrBa2Cu3-xCoxO7 (0≤x≤1)

被引：10

作者：

Alleno, E

Godart, C

Fisher, B

Genossar, J

Patlagan, L

Reisner, GM

机构：

[1] CNRS, LCMTR, F-94320 Thiais, France

[2] Univ Paris Sud, CNRS, LURE, F-91405 Orsay, France

[3] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[4] Technion Israel Inst Technol, Crown Ctr Supercond, IL-32000 Haifa, Israel

来源：

PHYSICA B-CONDENSED MATTER | 1999年 / 259-61卷

关键词：

high T-c; cuprates; Pr oxides; XANES;

D O I：

10.1016/S0921-4526(98)00643-7

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have performed XANES measurements at the Pr L-III-edge (similar to 5950-5980eV) in Y0.8Pr0.2Ba2CU3O6.95, PrBa2Cu3O6.94 and in PrBa2Cu3 -xCoxOy (x = 0.2, 0.3, 0.4, 0.5, 1.0 and y = 6.99, 7.0, 7.01, 7.05, 7.29, respectively). By comparing these spectra with those of praseodymium oxides (PrO= , z = 1.5, 1.71, 1.8, 1.83, 2) we derived the valence (nu) of Pr in these compounds. In Y0.8Pr0.2Ba2CU3O6.95 nu. = 3.4( +/- 0.1) and in PTBa2CU3O6.94 r = 3.18 ( +/- 0.05). Upon doping with Co, nu decreases progressively to nu = 3.0 for x similar to 0.4-0.5 and remains constant for x > 0.5. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：530 / 532

页数：3

共 8 条

[1] SPECIFIC INTERMEDIATE-VALENCE STATE OF INSULATING 4F COMPOUNDS DETECTED BY L3 X-RAY ABSORPTION [J].