In the Emery model, the maximum superconducting critical temperature increases with copper-oxygen energy distance at fixed charge gap, correlating with increased oxygen hole content and deeper charge-transfer character.
Physically, the hole that localizes in the charge-transfer insulator is shared between the Cu and O orbitals
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Correlation of maximum superconducting critical temperature with copper-oxygen energy distance and oxygen hole content in the Emery model
In the Emery model, the maximum superconducting critical temperature increases with copper-oxygen energy distance at fixed charge gap, correlating with increased oxygen hole content and deeper charge-transfer character.