Abstract
A series of cubic perovskite-type oxides, Sr1-xBaxFe4+O3 (\(0 \leq x \leq 1\)), have been studied through measurements of neutron diffraction and magnetization. It has been found that their helical spin structure changes from the G-type to the A-type with increasing Ba content at \(x \sim 0.85\). The application of an external magnetic field induces ferromagnetism with \({\sim}3.5\) µB/Fe, and the strength of the critical field decreases markedly from 39 T for SrFeO3 to 0.3 T for BaFeO3. The transition process can be categorized into three: SrFeO3, Sr0.4Ba0.6FeO3, and BaFeO3 types.
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