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The perovskite-type iron oxide Sr$_{2/3}$La$_{1/3}$FeO$_3$ is known to showcharacteristic spin-charge ordering (SCO), where sixfold collinear spinordering and threefold charge ordering are coupled with each other. Here, wereport the discovery of a spin-charge decoupling and an antiferromagnetic (AFM)state competing with the SCO phase in perovskites(Sr$_{1-x}$Ba$_x$)$_{2/3}$La$_{1/3}$FeO$_3$. By comprehensive measurementsincluding neutron diffraction, M$\"{o}$ssbauer spectroscopy, and x-rayabsorption spectroscopy, we found that the isovalent Ba$^{2+}$ substitutionsystematically reduces the critical temperature of the SCO phase andadditionally yields the spin-charge decoupling in $x$ > 0.75. Whereas theground state remains in the SCO phase in the whole $x$ region, an unexpectedG-type AFM phase with incoherent charge ordering or charge fluctuation appearsas the high-temperature phase in the range of $x$ > 0.75. Reflecting thecompeting nature between them, the G-type AFM phase partially exists as ametastable state in the SCO phase at low temperatures. We discuss the origin ofthe spin-charge decoupling and the emergence of the G-type AFM phase withcharge fluctuation in terms of the bandwidth reduction by the Ba substitution.

Spin-charge coupling and decoupling in perovskite-type iron oxides (Sr$_{1-x}$Ba$_x$)$_{2/3}$La$_{1/3}$FeO$_3$