Reconciling charged polarons with the anomalously small Curie-law susceptibility in lightly doped trans-polyacetylene

Results of restricted and unrestricted Hartee-Fock calculations on finite (C₂H₂)_x clusters and of Koster-Slater calculations on the infinite trans-polyacetylene chain suggest the possibility of eliminating the objection that the formation of a charged polaron due to doping is not consistent with susceptibility measurements. Proper self-consistent inclusion of electron-electron interaction leads to localized electronic states in the gap which are spin paired.