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Gapless dispersive continuum in a modulated quantum kagome antiferromagnet

Author

Listed:
  • 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)

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.

Suggested Citation

  • Asiri Thennakoon & Ryouga Yokokura & Yang Yang & Ryoichi Kajimoto & Mitsutaka Nakamura & Masahiro Hayashi & Chishiro Michioka & Gia-Wei Chern & Collin Broholm & Hiroaki Ueda & Seung-Hun Lee, 2025. "Gapless dispersive continuum in a modulated quantum kagome antiferromagnet," Nature Communications, Nature, vol. 16(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-58971-4
    DOI: 10.1038/s41467-025-58971-4
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