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By means of single-crystal X-ray diffraction we have revealed the breaking ofcentrosymmetry when lowering the temperature under T$_s$ = 200 K concomitantlywith the setting of a commensurate superstructure in the small A-site quadrupleperovskite YMn$_3$Mn$_4$O$_{12}$. This results is in agreement with all dataalready reported for this compounds and solve the previous inconsistency aboutthe Yttrium position. The superstructure is characterized by the appearing ofsatellite reflections in the single crystal pattern, consistent with anI-centered pseudo-orthorhombic commensurate supercell with $a \approx\sqrt{a_F} = 10.4352(7)$ \AA, $b \approx 2b_F = 14.6049(9)$ \AA, $c \approx\sqrt{c_F} = 10.6961(7)$ \AA and $\beta = 90.110(3)^\circ$, where F stands forthe "fundamental" high-temperature cell ($a_F \approx c_F \approx 7.45$ \AA,$b_F \approx 7.34$ \AA, and $\beta \approx 90^\circ$). The space-group wasunequivocally found to be Ia, which is non polar, thus allowing for a non-zeropolarization in the material. We then have investigated in detail thepyrocurrent, transport, dielectric and the DC and AC magnetic properties ofpolycrystalline sample of YMn$_3$Mn$_4$O$_{12}$ over a wide temperature range.These measurements clearly highlight several critical temperatures in thematerial and correlation between the different orders: i) the centrosymmetry isbroken at high temperature (T$_S$ = 200K), ii) then the long-range magneticorder of B-sites occurs at T$_{N,B}$ = 108 K and at this same temperature thecompound enters in an insulating dielectric state. iii) Finally, a remnantpolarization is stabilized concomitantly with a magnetic anomaly at T* = 70 K.We propose that YMn$_3$Mn$_4$O$_{12}$ is a peculiar magnetic ferroelectric inwhich the polar state is driven by short-range magnetic order.

Evidence for centrosymmetry breaking and multiferroic properties in the A-site ordered quadruple perovskite YMn$_3$Mn$_4$O$_{12}$