Magnetodielectric Effect in Crystals of the Noncentrosymmetric CaOFeS at Low Temperature

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• 作者：Charl猫ne Delacotte ; Olivier P茅rez ; Alain Pautrat ; David Berthebaud ; Sylvie H茅bert ; Emmanuelle Suard ; Denis Pelloquin ; Antoine Maignan
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：July 6, 2015
• 年：2015
• 卷：54
• 期：13
• 页码：6560-6565
• 全文大小：435K
• ISSN：1520-510X

文摘

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鈥揙 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.