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

Authors
Alleno, E Godart, C Fisher, B Genossar, J Patlagan, L Reisner, GM
Citation
E. Alleno et al., Valence of Pr in Y0.8Pr0.2Ba2Cu3O7 and PrBa2Cu3-xCoxO7 (0 <= x <= 1), PHYSICA B, 261, 1999, pp. 530-532
Citations number
8
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA B
ISSN journal
09214526 → ACNP
Volume
261
Year of publication
1999
Pages
530 - 532
Database
ISI
SICI code
0921-4526(199901)261:<530:VOPIYA>2.0.ZU;2-U
Abstract
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 compoun ds. 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 Elsevi er Science B.V. All rights reserved.