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Synthesis of a d1-titanium fluoride kagome lattice antiferromagnet
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Synthesis of a d1-titanium fluoride kagome lattice antiferromagnet
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Journal Article
Synthesis of a d1-titanium fluoride kagome lattice antiferromagnet
2020
Overview
The kagome lattice, composed of a planar array of corner-sharing triangles, is one of the most geometrically frustrated lattices. The realization of a spin S = 1/2 kagome lattice antiferromagnet is of particular interest because it may host an exotic form of matter, a quantum spin liquid state, which shows long-range entanglement and no magnetic ordering down to 0 K. A few S = 1/2 kagome lattice antiferromagnets exist, typically based on Cu2+, d9 compounds, though they feature structural imperfections. Herein, we present the synthesis of (CH3NH3)2NaTi3F12, which comprises an S = 1/2 kagome layer that exhibits only one crystallographically distinct Ti3+, d1 site, and one type of bridging fluoride. A static positional disorder is proposed for the interlayer CH3NH3+. No structural phase transitions were observed from 1.8 K to 523 K. Despite its spin-freezing behaviour, other features—including its negative Curie–Weiss temperature and a lack of long-range ordering—imply that this compound is a highly frustrated magnet with unusual magnetic phase behaviours.The highly frustrated spin-1/2 kagome lattice antiferromagnet, predicted to exhibit unconventional magnetic behaviours, has remained difficult to synthesize without structural imperfections. Now, a d1-titanium fluoride kagome lattice antiferromagnet has been prepared in which there is only one crystallographically distinct Ti3+ site and one type of bridging fluoride, and it is shown to be a frustrated magnet with unusual magnetic properties.
Publisher
Nature Publishing Group
Subject
