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Charge disproportionation and magnetic properties in perovskite iron oxides

Kuzushita, Kaori; Morimoto, Shotaro*; Nasu, Saburo*

The physical properties of perovskite iron oxides are closely related to the network of FeO$$_6$$ octahedra. The charge disproportionation (2Fe$$^{4+}$$ $$rightarrow$$ Fe$$^{3+}$$ + Fe$$^{5+}$$), not observed in SrFeO$$_3$$, occurs in the oxides being cut the network of FeO$$_6$$ octahedra, for example, by introduction of Fe$$^{3+}$$ by substitution La for Sr and change in the dimension by insertion of SrO layer. When Co is substituted 40% of Fe in Sr$$_3$$Fe$$_2$$O$$_7$$, the magnetic order changes to ferromagnetic from antiferromagnetic and charge disproportionation is suppressed.



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Category:Physics, Condensed Matter



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