Li X Y, Nocera A, Foyevtsova K, Sawatzky G A, Oudah M, Murai N, Kofu M, Matsuura M, Tamatsukuri H, Aronson M C
Stewart Blusson Quantum Matter Institute, The University of British Columbia, Vancouver, BC, Canada.
Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada.
Nat Mater. 2025 May;24(5):716-721. doi: 10.1038/s41563-025-02192-z. Epub 2025 Apr 8.
Electronic correlations lead to heavy quasiparticles in three-dimensional (3D) metals, and their collapse can destabilize magnetic moments. It is an open question whether there is an analogous instability in one-dimensional (1D) systems, unanswered due to the lack of metallic spin chain materials. We report neutron scattering measurements and density matrix renormalization group calculations establishing spinons in the correlated metal TiMnBi, confirming that its magnetism is 1D. TiMnBi is inherently frustrated, forming near a quantum critical point that separates different phases at temperature T = 0. One-dimensional magnetism dominates at the lowest T, and is barely affected by weak interchain coupling. TiMnBi is a previously unrecognized metallic spin chain in which 3D conduction electrons become strongly correlated due to their coupling to 1D magnetic moments.
电子关联导致三维（3D）金属中出现重准粒子，而它们的崩塌会使磁矩不稳定。在一维（1D）系统中是否存在类似的不稳定性仍是一个悬而未决的问题，由于缺乏金属自旋链材料，该问题尚未得到解答。我们报告了中子散射测量和密度矩阵重整化群计算，证实了相关金属TiMnBi中存在自旋子，确认其磁性为一维。TiMnBi本质上是受挫的，在温度T = 0时形成于分隔不同相的量子临界点附近。在最低温度下，一维磁性占主导，并且几乎不受弱链间耦合的影响。TiMnBi是一种先前未被认识的金属自旋链，其中三维传导电子由于与一维磁矩的耦合而变得高度相关。
