%0 Journal Article
%A García-Martín, Susana
%A Martínez de Irujo-Labalde, Xabier
%A Goto, Masato
%A Urones-Garrote, Esteban
%A Amador, Ulises
%A Ritter, Clemens
%A Amano Patino, Midori E
%A Koedtruad, Anucha
%A Tan, Zhenhong
%A Shimakawa, Yuichi
%T Multiferroism Induced by Spontaneous Structural Ordering inAntiferromagnetic Iron Perovskites
%D 2019
%@ ISSN: 0897-4756
%U https://hdl.handle.net/20.500.14352/12905
%X Room-temperature multiferroism in polycrystalline antiferromagnetic Fe perovskites is reported for the first time. In the perovskite-type oxides RE1.2Ba1.2Ca0.6Fe3O8 (RE = Gd, Tb), the interplay of layered ordering of Gd(Tb), Ba, and Ca atoms with the ordering of FeO4-tetrahedra (T) and FeO6-octahedra (O) results in a polar crystal structure. The layered structure consists of the stacking sequence of RE/Ca-RE/Ca-Ba-RE/Ca layers in combination with the TOOT sequence in a unit cell. A polar moment of 33.0 μC/cm2 for the Gd-oxide (23.2 μC/cm2 for the Tb one) is determined from the displacements of the cations, mainly Fe, and oxygen atoms along the b-axis. These oxides present antiferromagnetic ordering doubling the c-axis, and the magnetic structure in the Tb compound remains up to 690 K, which is one of the highest transition temperatures reported in Fe perovskites.
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