| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetic Phase Diagram of Cu$_{4-x}$Zn$_x$(OH)$_6$FBr Studied by Neutron-Diffraction and $\mu$SR Techniques |
| Yuan Wei1,2†, Xiaoyan Ma1,2†, Zili Feng1,3, Devashibhai Adroja4,5, Adrian Hillier4, Pabitra Biswas4, Anatoliy Senyshyn6, Andreas Hoser7, Jia-Wei Mei8, Zi Yang Meng1,9,10, Huiqian Luo1,10*, Youguo Shi1,10*, and Shiliang Li1,2,10* |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
3Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
4ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot Oxon OX11 0QX, United Kingdom
5Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa
6Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching D-85747, Germany
7Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
8Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
9Department of Physics and HKU-UCAS Joint Institute of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China
10Songshan Lake Materials Laboratory, Dongguan 523808, China
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| Cite this article: |
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Yuan Wei, Xiaoyan Ma, Zili Feng et al 2020 Chin. Phys. Lett. 37 107503 |
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Abstract We systematically investigate the magnetic properties of Cu$_{4-x}$Zn$_x$(OH)$_6$FBr using the neutron diffraction and muon spin rotation and relaxation (μSR) 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 μSR spectra provides two characteristic temperatures, $T_{A_0}$ and $T_{\lambda}$, which are associated with the initial drop close to zero time and the long-time exponential decay of the muon relaxation, respectively. Comparison between $T_{A_0}$ and $T_{\rm M}$ 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 $T_{\lambda}$ 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.
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Received: 23 July 2020
Published: 29 September 2020
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| PACS: |
75.50.Mm
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(Magnetic liquids)
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75.30.Kz
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(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
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76.75.+i
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(Muon spin rotation and relaxation)
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| Fund: Supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0302900, 2016YFA0300500, 2018YFA0704200, 2017YFA0303100, and 2016YFA0300600), the National Natural Science Foundation of China (Grant Nos. 11874401, 11674406, 11674372, 11961160699, 11774399, 12061130200, 11974392, and 11822411), the Strategic Priority Research Program(B) of the Chinese Academy of Sciences (Grant Nos. XDB25000000, XDB07020000, XDB33000000, and XDB28000000), the Beijing Natural Science Foundation (Grant Nos. Z180008 and JQ19002), Guangdong Introducing Innovative and Entrepreneurial Teams (Grant No. 2017ZT07C062), the Youth Innovation Promotion Association of CAS (Grant No. 2016004), and the Royal Society-Newton Advanced Fellowship (Grant No. NAF$\backslash$R1$\backslash$201248). |
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