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A combination of competing exchange interactions and substitutional disordergives rise to magnetic inhomogeneities in the[Y$_{2-x}$Mn$_x$]MnMnMn$_4$O$_{12}$ $x = 0.23$ and $x = 0.16$ quadrupleperovskite manganites. Our neutron powder scattering measurements show thatboth the $x = 0.23$ and $x = 0.16$ samples separate into two distinct magneticphases; below T$_{1}$ = 120 $\pm$ 10 K the system undergoes a transition from aparamagnetic phase to a phase characterised by short range antiferromagneticclusters contained in a paramagnetic matrix, and below T$_{2}$ $\sim$ 65 K, thesystem is composed of well correlated long range collinear ferrimagnetic order,punctuated by short range antiferromagnetic clusters. A sharp increase in theantiferromagnetic phase fraction is observed below $\sim$ 33 K, concomitantwith a decrease in the ferrimagnetic phase fraction. Our results demonstratethat the theoretically proposed AFM phase is stabilised in the[Y$_{2-x}$Mn$_x$]MnMnMn$_4$O$_{12}$ manganites in the presence of dominant B-Bexchange interactions, as predicted.

Magnetic inhomogeneities in the quadruple perovskite manganite [Y$_{2-x}$Mn$_x$]MnMnMn$_4$O$_{12}$