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Thennakoon, A.*; 横倉 涼雅*; Yang, Y.*; 梶本 亮一; 中村 充孝; 林 真弘*; 道岡 千城*; Chern, G.-W.*; Broholm, C.*; 植田 浩明*; et al.
Nature Communications (Internet), 16, p.3939_1 - 3939_13, 2025/04
被引用回数:0 パーセンタイル:0.00(Multidisciplinary Sciences)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 Cu (
,
) 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 Cs
RbK
Ti
F
where Ti
(
,
) 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
acquired at 1.5 K where the heat capacity is
-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.