自旋-1/2 蜂窝磁体中场诱导量子自旋液体行为的证据

Gaoting Lin, Mingfang Shu, Qirong Zhao, Gang Li, Yinina Ma, Jinlong Jiao, Yuting Li, Guijing Duan, Qing Huang, Jieming Sheng, Alexander I. Kolesnikov, Lu Li, Liusuo Wu, Hongwei Chen, Rong Yu, Xiaoqun Wang, Zhengxin Liu, Haidong Zhou, Jie Ma
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引用次数: 0

摘要

现代凝聚态物理学中最重要的问题之一是分化激元(如基塔耶夫量子自旋液体中的马约拉纳激元)的分析。为此,基于3d的基塔耶夫材料Na2Co2TeO6是一个很有希望的候选材料,它的磁相图B//a*在7.5T < |B| < 10 T范围内包含一个场诱导的中间磁无序相。实验观察结果,包括角度相关转矩中晶体点群对称性的恢复,以及非弹性中子散射谱中存在的磁子激发和自旋子连续,都有力地证明了这一无序相是具有部分极化自旋的场诱导量子自旋液体。我们用有效的K-J1-{/Gamma}-{/Gamma}'-J3模型进行的蒙特卡罗变量模拟再现了实验数据,并进一步支持了这一结论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evidence for field induced quantum spin liquid behavior in a spin-1/2 honeycomb magnet
One of the most important issues in modern condensed matter physics is the realization of fractionalized excitations, such as the Majorana excitations in the Kitaev quantum spin liquid. To this aim, the 3d-based Kitaev material Na2Co2TeO6 is a promising candidate whose magnetic phase diagram of B // a* contains a field-induced intermediate magnetically disordered phase within 7.5 T < |B| < 10 T. The experimental observations, including the restoration of the crystalline point group symmetry in the angle-dependent torque and the coexisting magnon excitations and spinon-continuum in the inelastic neutron scattering spectrum, provide strong evidence that this disordered phase is a field induced quantum spin liquid with partially polarized spins. Our variational Monte Carlo simulation with the effective K-J1-{\Gamma}-{\Gamma}'-J3 model reproduces the experimental data and further supports this conclusion.
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