XANES study on the evolution among different copper species, Cu-I, Cu-II and Cu-III, 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

1 Citation (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 the Cu1 species with increasing amount of excess oxygen, z, in Cu(1) Ba2 Y Cu(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)381-386
Number of pages6
JournalJournal of Low Temperature Physics
Volume131
Issue number3-4
DOIs
Publication statusPublished - May 2003
MoE publication typeA1 Journal article-refereed

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