Sr7-yAyMn4O15 (A: Ca, Ba): a new structural candidate for exhibiting a multiferroic ground state
The unique structure Sr7Mn4O15 is believed to possess the potential to behave as a multiferroic material, coupling weak ferromagnetism with ferroelectricity as a result of off-centre displacements of one each of its Sr and O positions. It has been shown that this phase is susceptible to anisotropic substitution of the Sr sublattice by Ca or Ba and that this has an impact on the magnetic susceptibility of the system, changing the broad maxima of the Sr7Mn4O15 to sharper peaks at lower temperatures and increasing divergence between field-cooled and zero field-cooled measurements. We have collected high-resolution powder neutron diffraction data (Experiment 5-23-723) on three isostructural samples (Sr7Mn4O15, Sr2Ca5Mn4O15 and Sr2Ba5Mn4O15) at 300 K, 100 K and 1.5 K. All samples exhibited magnetic Bragg peaks at 1.5 K; Rietveld refinement of this data suggests magnetic moments with components mainly along b but with possible components in the ac plane. In order to provide a more complete image of the magnetic structure of these phases, we request EASY access on Instrument D20 to collect high-intensity data on Sr2Ca5Mn4O15, allowing us to fully resolve the direction of the moments.
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CLARKE Gabriel and RITTER Clemens. (2019). Sr7-yAyMn4O15 (A: Ca, Ba): a new structural candidate for exhibiting a multiferroic ground state. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-492
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