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Structural changes and redistribution of holes by Sr-doping in YBa2Cu4O8

✍ Scribed by T. Ishigaki; F. Izumi; T. Wada; N. Suzuki; Y. Yaegashi; H. Asano; H. Yamauchi; S. Tanaka


Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
655 KB
Volume
191
Category
Article
ISSN
0921-4534

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Evidence against hole formation by Ca in
✍ M. Knupfer; N. NΓΌcker; M. Alexander; H. Romberg; P. Adelmann; J. Fink; J. Karpin πŸ“‚ Article πŸ“… 1991 πŸ› Elsevier Science 🌐 English βš– 391 KB

We report on electron energy-loss studies of Ca-doped YBa2Cu4Os. O I s and Ca 2p absorption edges indicate that there is almost no change of the hole concentration upon Ca doping and that a major fraction of the Ca enters the Ba site. This suggests that the increase of Tc upon Ca doping is not cause