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arXiv 2007.11816cond-mat.str-el
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Cu $_{4-x}$ Zn $_x$(OH)$_6$ FBr磁性phase diagram的中子衍射和$μ$ SR研究

Magnetic phase diagram of Cu$_{4-x}$Zn$_x$(OH)$_6$FBr studied by neutron-diffraction and $μ$SR techniques

Yuan Wei, Xiaoyan Ma, Zili Feng, Devashibhai Adroja, Adrian Hillier, Pabitra Biswas, Anatoliy Senyshyn, Chin-Wei Wang, Andreas Hoser, Jia-Wei Mei, Zi Yang Meng,… 展开作者

Yuan Wei, Xiaoyan Ma, Zili Feng, Devashibhai Adroja, Adrian Hillier, Pabitra Biswas, Anatoliy Senyshyn, Chin-Wei Wang, Andreas Hoser, Jia-Wei Mei, Zi Yang Meng, Huiqian Luo, Youguo Shi, Shiliang Li

摘要:

利用中子衍射和μ子自旋旋转与弛豫($μ$ SR)技术系统地研究了Cu $_{4-x}$ Zn $_x$(OH)$_6$ FBr的磁性.中子衍射测量表明,$x$ = 0样品中的长程磁序和正交核结构可以分别持续到$x$ = 0.23和0.43。零场(ZF)$μ$ SR谱的温度依赖性提供了两个特征温度,$T_{A0}$和$T_λ$。比较$T_{A0}$和$T_M$从以前报道的磁化率测量表明,前者来自短程层间自旋团簇,持续到$x$ = 0.82。另一方面,$T_λ$变为零的掺杂水平为约0.66,这比长程阶的阈值高得多,即,$\sim$ 0.4.我们的研究结果表明,核结构的变化可能会改变自旋动力学的kagome层和带隙的量子自旋液体状态可能存在以上$x$ = 0.66与完美的kagome平面。

英文摘要:

We have systematically studied the magnetic properties of Cu$_{4-x}$Zn$_x$(OH)$_6$FBr by the neutron diffraction and muon spin rotation and relaxation ($μ$SR) techniques. Neutron-diffraction measurements suggest that the long-range magnetic order and the orthorhombic nuclear structure in the $x$ = 0 sample can persist up to $x$ = 0.23 and 0.43, respectively. The temperature dependence of the zero-field (ZF) $μ$SR spectra provide two characteristic temperatures, $T_{A0}$ and $T_λ$. Comparison between $T_{A0}$ and $T_M$ from previously reported magnetic-susceptibility measurements suggest that the former comes from the short-range interlayer-spin clusters that persist up to $x$ = 0.82. On the other hand, the doping level where $T_λ$ becomes zero is about 0.66, which is much higher than threshold of the long-range order, i.e., $\sim$ 0.4. Our results suggest that the change in the nuclear structure may alter the spin dynamics of the kagome layers and a gapped quantum-spin-liquid state may exist above $x$ = 0.66 with the perfect kagome planes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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