XANES study on the evolution among different copper species, CuI, CuII and CuIII, in CuBa2YCu2O6+z upon oxygen loading

Y. Morita*, M. Karppinen, H. Yamauchi, R. S. Liu, J. M. Chen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

X-ray absorption near-edge structure (XANES) spectroscopy at the Cu L-edge is applied to follow the gradual formation of CUII and CuIII species from CuI with increasing amount of excess oxygen, z, in Cu(1) Ba2 YCu(2)2 O6+z. For the study, a series of samples with precisely controlled oxygen contents was prepared utilizing the temperature-controlled oxygen-depletion (TCOD) annealing technique in the sample synthesis and employing coulometric titration for accurate oxygen-content analysis. It may be concluded that at low amounts of excess oxygen, z, Cu(1)I in the charge reservoir tends to be first oxidized to Cu(1)II rather than directly to Cu(1) III, suggesting that complete chain formation does not occur at low oxygen contents.

Original languageEnglish
Pages (from-to)1205-1210
Number of pages6
JournalJournal of Low Temperature Physics
Volume131
Issue number5-6
DOIs
Publication statusPublished - Jun 2003
MoE publication typeA1 Journal article-refereed

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