K R Kannan
Articles written in Pramana – Journal of Physics
Volume 32 Issue 5 May 1989 pp 1- Rapid Communications
Cu K-absorption edges of YBa2Cu3O6.9, Tl2CaBa2Cu2O8 and Bi2CaSr2Cu2O8 show similar features. Copper is mainly in the 2+ state in these cuprates suggesting the likely presence of oxygen holes.
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