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• W2770338397 abstract "We report on the successful high-pressure synthesis of single-phase powders of the quadruple perovskite $({mathrm{YMn}}_{3}){mathrm{Mn}}_{4}{mathrm{O}}_{12}$, where the chemical pressure exerted by the small ${mathrm{Y}}^{3+}$ ion is expected to enhance the exchange interaction between ${mathrm{Mn}}^{3+}$ ions. According to this expectation, powder neutron diffraction, specific heat, and magnetization measurements give evidence of a C-type antiferromagnetic ordering of the ${mathrm{Mn}}^{3+}$ ions in the octahedrally coordinated $B$ sites at ${T}_{N,B}=108phantom{rule{0.28em}{0ex}}mathrm{K}$, 30 K higher than in the isostructural and isovalent compound, $({mathrm{LaMn}}_{3}){mathrm{Mn}}_{4}{mathrm{O}}_{12}$. Surprisingly, we found no evidence of long-range magnetic order of the square-coordinated ${A}^{ensuremath{'}}$ sites, although an indication of latent magnetic order is given by a broad peak of the DC magnetization between 70 and 40 K and by a sharp peak in the AC susceptibility at ${T}^{*}=70phantom{rule{0.28em}{0ex}}mathrm{K}$. A further unexpected feature of $({mathrm{YMn}}_{3}){mathrm{Mn}}_{4}{mathrm{O}}_{12}$, not found in previously reported $(A{mathrm{Mn}}_{3}){mathrm{Mn}}_{4}{mathrm{O}}_{12}$ compounds, is a second-order structural phase transition at ${T}_{s}=200phantom{rule{0.28em}{0ex}}mathrm{K}$, attributed to a partial redistribution of charge involving both the $B$ and ${A}^{ensuremath{'}}$-site ${mathrm{Mn}}^{3+}$ ions. The present results suggest the existence of competing magnetic orderings, which may be linked to the occurrence of magnetic ferroelectricity in the $(A{mathrm{Mn}}_{3}){mathrm{Mn}}_{4}{mathrm{O}}_{12}$ system." @default.
• W2770338397 created "2017-12-04" @default.
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• W2770338397 date "2017-11-28" @default.
• W2770338397 modified "2023-09-25" @default.
• W2770338397 title "Effect of chemical pressure induced by La3+/Y3+ substitution on the magnetic ordering of (AMn3)Mn4O12 quadruple perovskites" @default.
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• W2770338397 doi "https://doi.org/10.1103/physrevmaterials.1.064407" @default.
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