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Magnetodielectric Effect in Crystals of the Noncentrosymmetric CaOFeS at Low Temperature

C. Delacotte 1, 2 O. Perez 2 A. Pautrat 2 David Berthebaud 2 S. Hébert 2 E. Suard 3 D. Pelloquin 2 A. Maignan 2 
1 LaMIPS - Laboratoire de Microélectronique et de Physique des Semiconducteurs
CRISMAT - Laboratoire de cristallographie et sciences des matériaux, NXP Semiconductors [France], Presto Engineering Europe
Abstract : Single crystals of the stoichiometric iron calcium oxysulfide CaOFeS have been grown by a solid-state reaction. Structural analysis of CaOFeS at room temperature by combining single-crystal X-ray diffraction data and transmission electron microscopy leads to a stoichiometric hexagonal noncentrosymmetric P63mc layered structure isostructural to CaOZnS. It is built from alternating layers made of FeOS3 tetrahedra sharing sulfur apexes and stacked with Ca2+ planes. All Fe-O bonds are parallel to the stacking axis; this breaks the centrosymmetry, leading to a polar structure. The dielectric measurements reveal the existence of a magnetodielectric effect near 33 K in good agreement with the Neel temperature, as evidenced near 35 K by specific heat measurements reported by a different group. (Figure Presented). © 2015 American Chemical Society.
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C. Delacotte, O. Perez, A. Pautrat, David Berthebaud, S. Hébert, et al.. Magnetodielectric Effect in Crystals of the Noncentrosymmetric CaOFeS at Low Temperature. Inorganic Chemistry, American Chemical Society, 2015, 54 (13), pp.6560-6565. ⟨10.1021/acs.inorgchem.5b00879⟩. ⟨hal-02184139⟩



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