Gapless dispersive continuum in a modulated quantum kagome antiferromagnet

Asiri Thennakoon, Ryouga Yokokura, Yang Yang, Ryoichi Kajimoto, Mitsutaka Nakamura, Masahiro Hayashi, Chishiro Michioka, Gia-Wei Chern, Collin Broholm (), Hiroaki Ueda () and Seung-Hun Lee ()
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Asiri Thennakoon: University of Virginia
Ryouga Yokokura: Kyoto University
Yang Yang: University of Virginia
Ryoichi Kajimoto: Japan Atomic Energy Agency
Mitsutaka Nakamura: Japan Atomic Energy Agency
Masahiro Hayashi: Kyoto University
Chishiro Michioka: Kyoto University
Gia-Wei Chern: University of Virginia
Collin Broholm: The Johns Hopkins University
Hiroaki Ueda: Shimane University
Seung-Hun Lee: University of Virginia

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract The pursuit of quantum spin liquid (QSL) states in condensed matter physics has drawn attention to kagome antiferromagnets (AFM) where a two-dimensional corner-sharing network of triangles frustrates conventional magnetic orders. While quantum kagome AFMs based on Cu2+ (3d9, s = ½) ions have been extensively studied, there is so far little work beyond copper-based systems. Here we present our bulk magnetization, specific heat and neutron scattering studies on single crystals of a new titanium fluorides Cs8RbK3Ti12F48 where Ti3+ (3d1, s = ½) ions form a modulated quantum kagome antiferromagnet that does not order magnetically down to 1.5 K. Our comprehensive map of the dynamic response function $${{{\boldsymbol{S}}}}({{{\bf{Q}}}},\hslash {{{\boldsymbol{\omega }}}})$$ S ( Q , ℏ ω ) acquired at 1.5 K where the heat capacity is T-linear reveals a dispersive continuum emanating from soft lines that extend along (100). The data indicate fractionalized spinon-like excitations with quasi-one-dimensional dispersion within a quasi-two-dimensional spin system.

Date: 2025
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DOI: 10.1038/s41467-025-58971-4

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