Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet

Joanna Milam-Guerrero; Michelle Zheng; Nicole R. Spence; Mario Falsaperna; Stuart Calder; Saul Lapidus; Paul J. Saines; Brent C. Melot

doi:10.1021/acs.inorgchem.1c00113

Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet

Joanna Milam-Guerrero, Michelle Zheng, Nicole R. Spence, Mario Falsaperna, Stuart Calder, Saul Lapidus, Paul J. Saines, Brent C. Melot

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

3 Citations (SciVal)

Abstract

We present a study on the nuclear and magnetic structures of two iron-based garnets with magnetic cations isolated on tetrahedral sites. Ca2YZr2Fe3O12 and Ca2LaZr2Fe3O12 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.

Original language	English
Pages (from-to)	8500-8506
Number of pages	7
Journal	Inorganic Chemistry
Volume	60
Issue number	12
Early online date	2 Jun 2021
DOIs	https://doi.org/10.1021/acs.inorgchem.1c00113
Publication status	Published - 21 Jun 2021

Funding

J.M.-G. and B.C.M. gratefully acknowledge support from the Office of Naval Research (Grant # N00014-15-1-2411). This research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. M.F. and P.J.S. would like to thank the Leverhulme Trust for funding via a research project grant (RPG-2018-268).

Funders	Funder number
Office of Naval Research	N00014-15-1-2411
US Department of Energy
Parliamentary Office of Science and Technology
Basic Energy Sciences	DE-AC02-06CH11357
Oak Ridge National Laboratory
Leverhulme Trust	RPG-2018-268

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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10.1021/acs.inorgchem.1c00113

https://kar.kent.ac.uk/88315/

Cite this

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title = "Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet",

abstract = "We present a study on the nuclear and magnetic structures of two iron-based garnets with magnetic cations isolated on tetrahedral sites. Ca2YZr2Fe3O12 and Ca2LaZr2Fe3O12 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.",

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AU - Zheng, Michelle

AU - Spence, Nicole R.

AU - Falsaperna, Mario

AU - Calder, Stuart

AU - Lapidus, Saul

AU - Saines, Paul J.

AU - Melot, Brent C.

PY - 2021/6/21

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N2 - We present a study on the nuclear and magnetic structures of two iron-based garnets with magnetic cations isolated on tetrahedral sites. Ca2YZr2Fe3O12 and Ca2LaZr2Fe3O12 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.

AB - We present a study on the nuclear and magnetic structures of two iron-based garnets with magnetic cations isolated on tetrahedral sites. Ca2YZr2Fe3O12 and Ca2LaZr2Fe3O12 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.

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Influence of the Cubic Sublattice on Magnetic Coupling between the Tetrahedral Sites of Garnet

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