Study of the nuclear and magnetic structure of the novel multiferroic (YMn3)Mn4O12
We propose a powder neutron diffraction study of the nuclear and magnetic structure of the new quadruple perovskite YMn3Mn4O12 which displays a remarkable magnetic ferroelectric behaviour, similar to CaMn3Mn4O12 and LaMn3Mn4O12. As compared to the latter compounds, YMn3Mn4O12 exhibits significantly higher antiferromagnetic ordering temperatures, T(N,B)=108 K and T(N,A')=65 K, corresponding to the ordering of the B- and A'-sites, respectively, and an unexpected second-order phase transition at T*=202 K. These features prompt us to investigate the changes of the nuclear and magnetic structure across these transitions. Favourable conditions of the proposed study are the limited structural distortions inherent of the quadruple perovskite structure and the single-valent Mn(3+) characteristics of YMn3Mn4O12. We expect that the results obtained shall unveil clear correlations between the magnetic structure and the structural changes induced by the magnetic orderings, thus providing a hint as to the microscopic mechanism of spin-lattice coupling in magnetic ferroelectric and, specifically, the controversial role of the exchange striction and of the Dzyaloshinsky-Moriya interaction.
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VERSEILS Marine; BELLIN Christophe; CHAPON Laurent; DELMONTE Davide; Andrea Gauzzi; GILIOLI Edmondo and MEZZADRI FRANCESCO. (2016). Study of the nuclear and magnetic structure of the novel multiferroic (YMn3)Mn4O12. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2481
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