Study of crystallographic and magnetic structures of promising multiferroics: Co2MgTeO6, Co2ZnTeO6, Mn2MgTeO6, Mn2ZnTeO6
Co3TeO6 has been reported as a multiferroic material with a complex magnetic structure. It has a cryolite-related structure (C2/c) and several positions for the magnetic cations, which expands the degrees of freedom in the magnetic structure offering new possibilities for modifications and manipulations. It has three different magnetic transitions with different magnetic structures when the temperature is lowered below 26K. Also a strong anomaly in the dielectric constant is observed around 18K in zero magnetic field indicating the presence of an spontaneous polarization. Mn3TeO6 has a different crystallographic structure but very interesting magnetic properties due to an incommensurate magnetic structure below 23K. We have prepared the novel phases Co2MgTeO6, Co2ZnTeO6, Mn2MgTeO6 and Mn2ZnTeO6 and determined their structures by x-ray diffraction. Preliminary neutron diffraction measurements on Co2MgTeO6 show the appearance of magnetic peaks at low temperature. Therefore, this shows that, even in the presence of non-magnetic Mg and Te atoms, a long-range magnetic structure is established at low temperatures, for these promising new multiferroic phases.
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RETUERTO MILLAN Maria; ALONSO Jose Antonio; Christopher Røhl Andersen; FERNANDEZ DIAZ Maria Teresa and LEFMANN Kim. (2016). Study of crystallographic and magnetic structures of promising multiferroics: Co2MgTeO6, Co2ZnTeO6, Mn2MgTeO6, Mn2ZnTeO6. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2486
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