Abstract
Initially the Hartree-Fock approach to solids containing narrow occupied bands is reviewed. The presence of local states and hopping conductivity is considered in the single determinant limit. The consequences of such considerations are discussed for CuCl, CdS, and solid Ar and also for impurity states of O2− in CuCl and Si4− in CdS. Speculations as to the origin of anomalous diamagnetism in CuCl and both diamagnetism and ferromagnetism in CdS are made. Finally, it is seen that if one considers a particular limit of the Hartree (or Coulombic) potential in such systems, similar considerations apply to a local density model, and it is shown for solid Ar that a local density model exists which produces energy bands which are similar to those of previous Hartree-Fock plus correlation correction band studies.
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