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3D to 2D Magnetic Ordering of Fe3+ Oxides Induced by Their Layered Perovskite Structure.

ABSTRACT: The antiferromagnetic behavior of Fe3+ oxides of composition RE1.2Ba1.2Ca0.6Fe3O8, RE2.2Ba3.2Ca2.6Fe8O21, and REBa2Ca2Fe5O13 (RE = Gd, Tb) is highly influenced by the type of oxygen polyhedron around the Fe3+ cations and their ordering, which is coupled with the layered RE/Ba/Ca arrangement within the perovskite-related structure. Determination of the magnetic structures reveals different magnetic moments associated with Fe3+ spins in the different oxygen polyhedra (octahedron, tetrahedron, and square pyramid). The structural aspects impact on the strength of the Fe-O-Fe superexchange interactions and, therefore, on the Néel temperature (TN) of the compounds. The oxides present an interesting transition from three-dimensional (3D) to two-dimensional (2D) magnetic behavior above TN. The 2D magnetic interactions are stronger within the FeO6 octahedra layers than in the FeO4 tetrahedra layers.

SUBMITTER: de Irujo-Labalde XM 

PROVIDER: S-EPMC8478276 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature

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3D to 2D Magnetic Ordering of Fe<sup>3+</sup> Oxides Induced by Their Layered Perovskite Structure.

de Irujo-Labalde Xabier Martínez XM   Amador Ulises U   Ritter Clemens C   Goto Masato M   Patino Midori Amano MA   Shimakawa Yuichi Y   García-Martín Susana S  

Inorganic chemistry 20210519 11

The antiferromagnetic behavior of Fe<sup>3+</sup> oxides of composition RE<sub>1.2</sub>Ba<sub>1.2</sub>Ca<sub>0.6</sub>Fe<sub>3</sub>O<sub>8</sub>, RE<sub>2.2</sub>Ba<sub>3.2</sub>Ca<sub>2.6</sub>Fe<sub>8</sub>O<sub>21</sub>, and REBa<sub>2</sub>Ca<sub>2</sub>Fe<sub>5</sub>O<sub>13</sub> (RE = Gd, Tb) is highly influenced by the type of oxygen polyhedron around the Fe<sup>3+</sup> cations and their ordering, which is coupled with the layered RE/Ba/Ca arrangement within the perovskite-related st  ...[more]

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