Role of the Madelung energy in hole conductivity in copper oxides: Difference between semiconductors and high-Tc superconductors.

@article{Torrance1989RoleOT,
  title={Role of the Madelung energy in hole conductivity in copper oxides: Difference between semiconductors and high-Tc superconductors.},
  author={Torrance and Metzger},
  journal={Physical review letters},
  year={1989},
  volume={63 14},
  pages={1515-1518}
}