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Spin-charge coupling and decoupling in perovskite-type iron oxides <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ba</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>…
The perovskite-type iron oxide ${\mathrm{Sr}}_{2/3}{\mathrm{La}}_{1/3}{\mathrm{FeO}}_{3}$ is known to show characteristic spin-charge ordering (SCO), where sixfold collinear spin ordering and threefold charge ordering are coupled with each other. Here, we report the discovery of a spin-charge decoupling and an antiferromagnetic (AFM) state competing with the SCO phase in perovskites ${({\mathrm{Sr}}_{1\ensuremath{-}x}{\mathrm{Ba}}_{x})}_{2/3}{\mathrm{La}}_{1/3}{\mathrm{FeO}}_{3}$. By …