Freezing of the Lattice in the Kagome Lattice Heisenberg Antiferromagnet Zn-Barlowite 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>ZnCu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mrow><mml:mi>OD</mml:mi></mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub><mml:mi>FBr</mml:mi></mml:mrow></mml:math>

Wang, Jiaming; Yuan, Weishi; Singer, Philip M.; Smaha, Rebecca W.; He, Wei; Wen, Jiajia; Lee, Y. S.; Imai, Takashi

doi:10.1103/physrevlett.128.157202

Phys. Rev. Lett.

2022

DOI: 10.1103/physrevlett.128.157202

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Freezing of the Lattice in the Kagome Lattice Heisenberg Antiferromagnet Zn-Barlowite ZnCu3(OD)6FBr

Jiaming Wang

Weishi Yuan

Philip M. Singer

et al.

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Cited by 8 publications

References 46 publications

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Experimental signatures of quantum and topological states in frustrated magnetism

Khatua,

Sana,

Zorko

et al. 2023

Physics Reports

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Experimental signatures of quantum and topological states in frustrated magnetism

Khatua,

Sana,

Zorko

et al. 2023

Physics Reports

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Chemical Design of Spin Frustration to Realize Topological Spin Glasses

Amtry,

Campello,

Tong

et al. 2024

J. Am. Chem. Soc.

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Patterning spins to generate collective behavior is at the core of condensed matter physics. Physicists develop techniques, including the fabrication of magnetic nanostructures and precision layering of materials specifically to engender frustrated lattices. As chemists, we can access such exotic materials through targeted chemical synthesis and create new lattice types by chemical design. Here, we introduce a new approach to induce magnetic frustration on a modified honeycomb lattice through a competition of alternating antiferromagnetic (AFM) and ferromagnetic (FM) nearest-neighbor interactions. By subtly modulating these two types of interactions through facile synthetic modifications, we created two systems: (1) a topological spin glass and (2) a frustrated spin-canted magnet with low-temperature exchange bias. To design this unconventional magnetic lattice, we used a metal−organic framework (MOF) platform, Ni 3 (pymca) 3 X 3 (NipymcaX where pymca = pyrimidine-2-carboxylato and X = Cl, Br). We isolated two MOFs, NipymcaCl and NipymcaBr, featuring canted Ni 2+ -based moments. Despite this similarity, differences in the single-ion anisotropies of the Ni 2+ spins result in distinct magnetic properties for each material. NipymcaCl is a topological spin glass, while NipymcaBr is a rare frustrated magnet with low-temperature exchange bias. Density functional theory calculations and Monte Carlo simulations on the NipymcaX lattice support the presence of magnetic frustration as a result of alternating AFM and FM interactions. Our calculations enabled us to determine the ground-state spin configuration and the distribution of spin−spin correlations relative to paradigmatic kagoméand triangular lattices. This modified honeycomb lattice is similar to the electronic Kekule-O phase in graphene and provides a highly tunable platform to realize unconventional spin physics.

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Emergence of the spin polarized domains in the kagome lattice Heisenberg antiferromagnet Zn-barlowite (Zn0.95Cu0.05)Cu3(OD)6FBr

et al. 2022

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Kagome lattice Heisenberg antiferromagnets are known to be highly sensitive to perturbations caused by the structural disorder. NMR is a local probe ideally suited for investigating such disorder-induced effects, but in practice, large distributions in the conventional one-dimensional NMR data make it difficult to distinguish the intrinsic behavior expected for pristine kagome quantum spin liquids from disorder-induced effects. Here we report the development of a two-dimensional NMR data acquisition scheme applied to Zn-barlowite (Zn0.95Cu0.05)Cu3(OD)6FBr kagome lattice, and successfully correlate the distribution of the low energy spin excitations with that of the local spin susceptibility. We present evidence for the gradual growth of domains with a local spin polarization induced by 5% Cu2+ defect spins occupying the interlayer non-magnetic Zn2+ sites. These spin-polarized domains account for ~60% of the sample volume at 2 K, where gapless excitations induced by interlayer defects dominate the low-energy sector of spin excitations within the kagome planes.

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Freezing of the Lattice in the Kagome Lattice Heisenberg Antiferromagnet Zn-Barlowite ZnCu3(OD)6FBr

Cited by 8 publications

References 46 publications

Experimental signatures of quantum and topological states in frustrated magnetism

Experimental signatures of quantum and topological states in frustrated magnetism

Chemical Design of Spin Frustration to Realize Topological Spin Glasses

Emergence of the spin polarized domains in the kagome lattice Heisenberg antiferromagnet Zn-barlowite (Zn0.95Cu0.05)Cu3(OD)6FBr

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