MAGNETIC STATE OF IMPURITY IRON ATOMS IN INDIUM (III) OXIDE Fe:In2O3–δ DEPENDING ON OXYGEN CONTENT

Calculations in the coherent potential approximation have confirmed modern concepts of various charge, spin, and magnetic states of impurity iron atoms replacing indium atoms in (In_0.95Fe_0.05)₂O_3–δ oxide with nonstoichiometric oxygen compositions (0 < δ ≤ 0.09). The transition of impurity iron atoms from a paramagnetic to a ferromagnetic state is described. It was found that the transition occurs at different concentrations of oxygen vacancies for two crystallographically nonequivalent types of impurity iron atoms and is accompanied by a change in the charge state of the impurity.