Ferromagnetism Induced by Substitution of the Iron(IV) Ion by an Unusual High-Valence Nickel(IV) Ion in Antiferromagnetic SrFeO3

摘要

Novel cubic perovskites SrFe1-xNixO3 (0 <= x <= 0.5) with unusual high-valence iron(IV) and nickel(IV) ions were obtained by high-pressure and high-temperature synthesis. Substantial magnetic moments of Ni-IV, which is intrinsically nonmagnetic with a nominal d(6) electron configuration, were induced by the large magnetic moments of Fe-IV through orbital hybridization with oxygen. As a result, ferromagnetism with the transition temperature (T-c) above room temperature could be induced.