| Autor: |
Liang, G., Liu, R. S., Wang, L. V. |
| Předmět: |
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| Zdroj: |
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics; 12/20/99, Vol. 13 Issue 29/31, p3693, 4p |
| Abstrakt: |
Near edge x-ray-absorption spectra at Pb L[sub 3]-edges have been measured for (Tl[sub 0.5]Pb[sub 0.5])Sr[sub 2]Ca[sub 1 - χ]Y[sub χ]Cu[sub 2]O[sub 7 - δ] compound series. It is found that the intensity of the 2p → 6s transition feature decreases with the substitution of Ca[sup +2] by y[sup +3]. This result indicates that some electronic charges have been transferred into the Pb(Tl)-O layers by this substitution. Detailed analysis suggests that the valence value of Pb in this compound series is close to +4 and it decreases with the increase of the Y-doping level χ. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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