title: Magnetodielectric Effect in Crystals of the Noncentrosymmetric CaOFeS at Low Temperature.
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 Ca(2+) 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.
authors.affiliation: †Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France.
authors.forename: Charlène
authors.initials: C
authors.lastname: Delacotte
authors.affiliation: †Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Pérez
authors.affiliation: †Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Pautrat
authors.affiliation: †Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France.
authors.forename: David
authors.initials: D
authors.lastname: Berthebaud
authors.affiliation: †Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Hébert
authors.affiliation: ‡Institut Laue-Langevin (ILL), 71 avenue des Martyrs, 38042 Grenoble Cedex 9, France.
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Suard
authors.affiliation: †Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Pelloquin
authors.affiliation: †Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France.
authors.forename: Antoine
authors.initials: A
authors.lastname: Maignan