Fluctuating magnetic droplets immersed in a sea of quantum spin liquid.
Fluctuating magnetic droplets immersed in a sea of quantum spin liquid.
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DOI：
10.1016/j.xinn.2023.100459
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发表时间：
2023-09-11
期刊：
影响因子：
32.1
通讯作者：
Shu, Lei
中科院分区：
文献类型：
--
作者：
Zhu, Zihao;Pan, Binglin;Nie, Linpeng;Ni, Jiamin;Yang, Yanxing;Chen, Changsheng;Jiang, Chengyu;Huang, Yeyu;Cheng, Erjian;Yu, Yunjie;Miao, Jianjian;Hillier, Adrian D.;Chen, Xianhui;Wu, Tao;Zhou, Yi;Li, Shiyan;Shu, Lei
量子自旋液体（QSL）是一种具有强涨落和高纠缠自旋的奇异磁态，是当前凝聚态物理研究的一个重要课题。然而，到目前为止，还没有确凿的证据表明任何QSL候选者中存在解除限制的自旋。无序和竞争交换相互作用可能会阻止阻挫自旋晶格上理想QSL态的形成。本文报道了NaYbSe 2单晶的磁化率、超低温比热、μ子自旋弛豫（μSR）、核磁共振（NMR）和热导率的全面和系统的测量结果。在NaYbSe 2单晶中，有效自旋为-1/2的Yb 3+离子形成完美的三角晶格。所有这些互补的技术都没有发现在它们各自的基础温度下存在长程磁序的证据。相反，比热，μSR和NMR测量表明NaYbSe 2中准静态和动态自旋共存。来自这些准静态自旋的散射可能导致磁热导率的缺失。因此，我们提出了一个方案的波动亚铁磁液滴沉浸在海的QSL。这可能是在追求理想QSL的过程中非常常见的，并为研究QSL态如何在杂质中生存以及与其他磁有序态共存提供了一个全新的平台。多种技术用于研究QSL候选NaYbSe 2。所有的技术都证实了长程磁序的不存在。在μSR和NMR中都观察到准静态和动态自旋的共存。热导率的结果表明，巡回无隙磁激发的情况下。提出了一个浸没在QSL海洋中的涨落亚铁磁液滴的方案。
The search of quantum spin liquid (QSL), an exotic magnetic state with strongly fluctuating and highly entangled spins down to zero temperature, is a main theme in current condensed matter physics. However, there is no smoking gun evidence for deconfined spinons in any QSL candidate so far. The disorders and competing exchange interactions may prevent the formation of an ideal QSL state on frustrated spin lattices. Here we report comprehensive and systematic measurements of the magnetic susceptibility, ultralow-temperature specific heat, muon spin relaxation (μSR), nuclear magnetic resonance (NMR), and thermal conductivity for NaYbSe2 single crystals, in which Yb3+ ions with effective spin-1/2 form a perfect triangular lattice. All these complementary techniques find no evidence of long-range magnetic order down to their respective base temperatures. Instead, specific heat, μSR, and NMR measurements suggest the coexistence of quasi-static and dynamic spins in NaYbSe2. The scattering from these quasi-static spins may cause the absence of magnetic thermal conductivity. Thus, we propose a scenario of fluctuating ferrimagnetic droplets immersed in a sea of QSL. This may be quite common on the way pursuing an ideal QSL, and provides a brand new platform to study how a QSL state survives impurities and coexists with other magnetically ordered states. Multiple techniques are used to study QSL candidate NaYbSe2. The absence of long-range magnetic order is confirmed by all techniques. Coexistence of quasi-static and dynamic spins is observed in both μSR and NMR. Results of thermal conductivity suggest the absence of itinerant gapless magnetic excitations. A scenario of fluctuating ferrimagnetic droplets immersed in a sea of QSL is proposed.
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