Crystal and magnetic structures of new spinel type phases
As part of Stanislav Podchezertsev's thesis (in co-direction between CRISMAT and ILL) we started to study new ordered spinel phases Co5-xZnxTeO8. We particularly interested in polymorphic phases Co5TeO8: the disordered phase (centrosymmetric Fd-3m) and the ordered phase (non-centrosymmetric P4332). For this latter, short-range magnetic domains appear below 60 K followed by the emergence of an incommensurate conical-spiral magnetic ordering below 50 K which allows magnetoelectric coupling. The behavior only exists in the ordered phase. Thus, the search of new ordered spinels is of interest to find new magnetoelectric materials. In this context, we synthesized polycrystalline samples of Co4FeSbO8, Co4MnSbO8, Co2Cr3GaO8. Until now, we only obtained the disordered phases. Nevertheless, preliminary SQUID measurements show interesting magnetic behaviors with several magnetic transitions. We need neutron diffraction data to characterize the magnetic transitions, the crystal and magnetic structures of these disordered phases. These studies are essential to evidence the driving forces which allow the appearance of the magnetoelectric coupling in the ordered spinel phases.
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BARRIER Nicolas; PODCHEZERTSEV Stanislav and SUARD Emmanuelle. (2018). Crystal and magnetic structures of new spinel type phases. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2590
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