FeMn<inf>3</inf>Ge<inf>2</inf>Sn<inf>7</inf>O<inf>16</inf>: A Perfectly Isotropic 2-D Kagomé Lattice that Breaks Magnetic Symmetry with Partial Spin Order

Allison, MC; Wurmehl, S; Büchner, B; Vella, JL; Söhnel, T; Bräuninger, SA; Klauss, HH; Avdeev, M; Marlton, FP; Schmid, S; Ling, CD

FeMn<inf>3</inf>Ge<inf>2</inf>Sn<inf>7</inf>O<inf>16</inf>: A Perfectly Isotropic 2-D Kagomé Lattice that Breaks Magnetic Symmetry with Partial Spin Order

Allison, MC Wurmehl, S Büchner, B Vella, JL Söhnel, T Bräuninger, SA Klauss, HH Avdeev, M Marlton, FP Schmid, S Ling, CD

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Publisher:: American Chemical Society (ACS)
Publication Type:: Journal Article
Citation:: Chemistry of Materials, 2022, 34, (3), pp. 1369-1375
Issue Date:: 2022-02-08

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Field	Value	Language
dc.contributor.author	Allison, MC
dc.contributor.author	Wurmehl, S
dc.contributor.author	Büchner, B
dc.contributor.author	Vella, JL
dc.contributor.author	Söhnel, T
dc.contributor.author	Bräuninger, SA
dc.contributor.author	Klauss, HH
dc.contributor.author	Avdeev, M
dc.contributor.author	Marlton, FP
dc.contributor.author	Schmid, S
dc.contributor.author	Ling, CD
dc.date.accessioned	2023-04-17T01:38:48Z
dc.date.available	2023-04-17T01:38:48Z
dc.date.issued	2022-02-08
dc.identifier.citation	Chemistry of Materials, 2022, 34, (3), pp. 1369-1375
dc.identifier.issn	0897-4756
dc.identifier.issn	1520-5002
dc.identifier.uri	http://hdl.handle.net/10453/169845
dc.description.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 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.
dc.language	en
dc.publisher	American Chemical Society (ACS)
dc.relation.ispartof	Chemistry of Materials
dc.relation.isbasedon	10.1021/acs.chemmater.1c04060
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences, 09 Engineering
dc.subject.classification	Materials
dc.title	FeMn<inf>3</inf>Ge<inf>2</inf>Sn<inf>7</inf>O<inf>16</inf>: A Perfectly Isotropic 2-D Kagomé Lattice that Breaks Magnetic Symmetry with Partial Spin Order
dc.type	Journal Article
utslib.citation.volume	34
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access	*
dc.date.updated	2023-04-17T01:38:47Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	34
utslib.citation.issue	3

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 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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http://hdl.handle.net/10453/169845