FeMn3Ge2Sn7O16: a perfectly isotropic 2-D kagomé lattice that breaks magnetic symmetry with partial spin order
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Open Access
Type
ArticleAuthor/s
Allison, Morgan CWurmehl, Sabine
Büchner, Bernd
Vella, Joseph L.
Söhnel, Tilo
Bräuninger, Sascha A.
Klauss, Hans-Henning
Avdeev, Maxim
Marlton, Frederick P.
Schmid, Siegbert
Ling, Chris D
Abstract
FeMn3Ge2Sn7O16 is a fully ordered stoichiometric phase containing an undistorted hexagonal kagomé lattice of Mn2+ cations. It represents not only an important expansion of the chemistry of the complex composite FeFe3Si2Sn7O16 structure type, by replacing silicon with germanium, but ...
See moreFeMn3Ge2Sn7O16 is a fully ordered stoichiometric phase containing an undistorted hexagonal kagomé lattice of Mn2+ cations. It represents not only an important expansion of the chemistry of the complex composite FeFe3Si2Sn7O16 structure type, by replacing silicon with germanium, but also an improvement on the perfection of the kagomé lattice by replacing anisotropic high-spin Fe2+ (d6, L = 2) with isotropic high-spin Mn2+ (d5, L = 0), controlled by the size-matched replacement of SiO44– with GeO44– bridging units. This anisotropy was suspected of playing a role in the unique “striped” magnetic structure of FeFe3Si2Sn7O16 at low temperatures, which breaks hexagonal symmetry and leaves one-third of the magnetic moments geometrically frustrated and fluctuating down to at least 0.1 K. We observe the same striped magnetic structure in FeMn3Ge2Sn7O16, ruling out single-ion anisotropy as the driving force and deepening the intrigue around the apparent “partial spin-liquid” nature of these compounds.
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See moreFeMn3Ge2Sn7O16 is a fully ordered stoichiometric phase containing an undistorted hexagonal kagomé lattice of Mn2+ cations. It represents not only an important expansion of the chemistry of the complex composite FeFe3Si2Sn7O16 structure type, by replacing silicon with germanium, but also an improvement on the perfection of the kagomé lattice by replacing anisotropic high-spin Fe2+ (d6, L = 2) with isotropic high-spin Mn2+ (d5, L = 0), controlled by the size-matched replacement of SiO44– with GeO44– bridging units. This anisotropy was suspected of playing a role in the unique “striped” magnetic structure of FeFe3Si2Sn7O16 at low temperatures, which breaks hexagonal symmetry and leaves one-third of the magnetic moments geometrically frustrated and fluctuating down to at least 0.1 K. We observe the same striped magnetic structure in FeMn3Ge2Sn7O16, ruling out single-ion anisotropy as the driving force and deepening the intrigue around the apparent “partial spin-liquid” nature of these compounds.
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Date
2022Source title
Chemistry of MaterialsVolume
34Publisher
American Chemical SocietyFunding information
ARC DP190101862Rights statement
"This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, Copyright © 2022 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.chemmater.1c04060."Faculty/School
Faculty of Science, School of ChemistryShare