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Influence of the cubic sublattice on magnetic coupling between the tetrahedral sites of garnet

Milam-Guerrero, JoAnna, Zheng, Michelle, Spence, Nicole R, Falsaperna, Mario, Calder, Stuart, Lapidus, Saul, Saines, P.J., Melot, Brent C (2021) Influence of the cubic sublattice on magnetic coupling between the tetrahedral sites of garnet. Inorganic Chemistry, 60 (12). pp. 8500-8506. ISSN 0020-1669. (doi:10.1021/acs.inorgchem.1c00113) (KAR id:88315)

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We present a study on the nuclear and magnetic structures of two iron-based garnets with magnetic cations isolated on tetrahedral sites. Ca\(_2\)YZr\(_2\)Fe\(_3\)O\(_{12}\) and Ca\(_2\)LaZr\(_2\)Fe\(_3\)O\(_{12}\) offer an interesting comparison for examining the effect of increasing cation size within the diamagnetic backbone of the garnet crystal structure, and how such changes affect the magnetic order. Despite both systems exhibiting well-pronounced magnetic transitions at low temperatures, we also find evidence for diffuse magnetic scattering due to a competition between the nearest-neighbor, next nearest-neighbor, and so on, within the tetrahedral sites. This competition results in a complex noncollinear magnetic structure on the tetrahedral sublattice creating a mixture of ferro- and antiferromagnetic interactions above the long-range ordering temperature near 20 K and suggests that the cubic site of the garnet plays a significant role in mediating the superexchange interactions between tetrahedral cations.

Item Type: Article
DOI/Identification number: 10.1021/acs.inorgchem.1c00113
Subjects: Q Science > QD Chemistry
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Paul Saines
Date Deposited: 21 May 2021 11:01 UTC
Last Modified: 01 Jun 2022 23:00 UTC
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