Effects of Ca2+ and La3+ in Y1-xCaxBa2-xLaxCu3Oy study - An X-ray absorption spectroscopy

C. H. Hsieh, C. N. Chang, S. B. Lee, H. C.I. Kao, C. H. Chin

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A series of samples, Y1-xCaxBa2-xLaxCu3Oy (x = 0 ∼ 0.6), were prepared and studied by X-ray absorption near-edge spectroscopy (XANES). The oxygen content y in these samples remained about the same for all x. Both the O-1s and Cu-2p3/2 XANES results indicate that the total number of holes remained essentially unchanged. The O-1s XANES gives no sign showing that there are La ions on the Y sites. Our data indicated that the Ca2+ and La3+ doping changed not only the lattice symmetry but also the electronic structure at the Fermi energy in the valence band. The results derived from the O-1s XANES showed that the holes on the CuO2 planes decreased, while the holes on the O(1) and O(5) sites en the basal plane increased, as the doping concentration x increased.

Original languageEnglish
Pages (from-to)59-69
Number of pages11
JournalChinese Journal of Physics
Issue number1
Publication statusPublished - 2003 Feb

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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