Multiferroism Induced by Spontaneous Structural Ordering in
Antiferromagnetic Iron Perovskites

García-Martín, Susana; Martínez de Irujo-Labalde, Xabier; Goto, Masato; Urones-Garrote, Esteban; Amador, Ulises; Ritter, Clemens; Amano Patino, Midori E; Koedtruad, Anucha; Tan, Zhenhong; Shimakawa, Yuichi

Multiferroism Induced by Spontaneous Structural Ordering in Antiferromagnetic Iron Perovskites

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acs.chemmater.9b02716.pdf (4.11 MB)

Official URL

DOI: 10.1021/acs.chemmater.9b02716

Publication date

2019

Authors

García-Martín, Susana

Martínez de Irujo-Labalde, Xabier

Goto, Masato

Urones-Garrote, Esteban

Amador, Ulises

Ritter, Clemens

Amano Patino, Midori E

Koedtruad, Anucha

Tan, Zhenhong

Shimakawa, Yuichi

Publisher

American Chemical Society

Citations

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URI

https://hdl.handle.net/20.500.14352/12905

Abstract

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.