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arXiv 2608.29323cond-mat.str-el

nabokoite家族装饰型方形 kagomé 晶格磁体中解耦自旋子系统的实验观测

Experimental observation of decoupled spin subsystems in decorated square kagomé lattice magnets of the nabokoite family

V. N. Glazkov, Ya V. Rebrov, M. A. Dubovitskii, M. M. Markina, A. F. Murtazoev, P. S. Berdonosov, A. N. Vasiliev

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中文总结 AI 辅助

本研究观测到 nabokoite 家族磁体的复杂交换网络可分裂为两个几乎解耦的自旋子系统,证实其存在共存磁有序与潜在自旋液体动力学,挑战了装饰型阻挫晶格的传统模型。

中文摘要 AI 辅助

方形 kagomé 晶格(SKL)为研究二维系统中的几何阻挫提供了模型平台。nabokoite 家族化合物 nabok{A}{X}(A=Na、K、Cs、Rb,X=Cl、Br)将该物理特性扩展至三维网络,其中二维 SKL 层被层间自旋装饰。利用电子顺磁共振(EPR),我们证实该复杂交换网络可显著分裂为两个几乎解耦的自旋子系统:电子顺磁共振吸收的绝对校准显示,nabokoite 中仅一部分铜自旋具有 EPR 活性,且这部分自旋在奈尔点发生有序排列。对比 EPR 吸收与静态磁化率可知,EPR 沉默自旋子系统对总磁化率的贡献随冷却降低。这种对单一化合物中共存磁有序与潜在自旋液体动力学的直接观测,对装饰型阻挫晶格中统一交换网络的传统模型提出了挑战。

英文摘要

The square kagomé lattice (SKL) offers a model platform for investigating geometric frustration in 2D systems. Nabokoite-family compounds \nabok{A}{X} (A=Na, K, Cs, Rb and X=Cl, Br) extend this physics to a 3D network, where 2D SKL layers are decorated by interlayer spins. Using electron paramagnetic resonance (EPR), we demonstrate a dramatic splitting of this complex exchange network into two virtually decoupled spin subsystems: absolute calibration of the electron paramagnetic resonance (EPR) absorption reveals that only a fraction of all copper spins in nabokoites is EPR-active and this fraction of the spins orders at the Néel point. Comparison of the EPR absorption and static susceptibility indicates that contribution of the EPR-silent spin subsystem to total magnetic susceptibility decreases on cooling. This direct observation of coexisting magnetic order and possible spin-liquid dynamics within a single compound challenges conventional models of unified exchange networks in decorated frustrated lattices.

发表机构

  • P.L. Kapitza Institute for Physical Problems, RAS(俄罗斯科学院P.L.卡皮察物理问题研究所)
  • National Research University “HSE”(高等经济国立大学)
  • M.V. Lomonosov Moscow State University(莫斯科罗蒙诺索夫国立大学)
  • National University of Science and Technology “MISiS”(莫斯科国立科学与技术大学)

机构由 AI 辅助整理,请以论文原文为准。

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