This study addresses the nature of the hole states in the high oxidation state cuprates. From the thermochemistry of oxidation in the cuprate superconductors, specifically inLa2-xAxCuO4-x/2+δ (A =Ba, Sr, Ca, Pb) and YBa2Cu3O6+δ, a model is proposed that assigns a major fraction of the holes in these "Cu3+" materials to states which chemically are "peroxidelike," involving holes paired on adjacent oxygens. Based on this hypothesis previously reported structural observations on NaCuO2, KCuO2,La2-xSrxCuO4-x/2+δ, and YBa2Cu3O6+δ are modeled. Electrical properties (including superconductivity) of the high oxidation state cuprates are closely related to these structural trends.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry