Electronic screening effect in K3C60 crystal

By using the electrostatic screening Coulomb interaction, introducing scree ning parameters, and taking account of the short-range interaction between ions, the authors calculated the variation of the cohesive energies of all kinds of ion and cell in K3C60 crystal with the change of screening paramet ers. The results show that the electronic screening is the screening to the potassium ion, especially to the one on the tetrahedral center sites. Alth ough the screening parameters are very small, it is very important for the stability of the crystal.