Gapped Spin-l/2 Spinon Excitations in a New Kagome Quantum Spin Liquid Compound CuaZn（OH）6FBr

We report a new kagome quantum spin liquid candidate CuaZn（OH）6FBr, which does not experience any phase transition down to 50inK, more than three orders lower than the antiferromagnetic Curie-Weiss temperature （-200 K）. A clear gap opening at low temperature is observed in the uniform spin susceptib...

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Published in中国物理快报：英文版 Vol. 34; no. 7; pp. 249 - 253
Main Author 冯子力 李政 孟鑫 衣玮 魏源 张骏 王艳成 蒋伟 刘峥 李世燕 刘锋 雒建林 李世亮 郑国庆 孟子杨 梅佳伟 石友国
Format Journal Article
LanguageEnglish
Published 2017
Subjects
Weiss
体复合
分数自旋
分数量子
核磁共振测量
激励特性
自旋系统
量子自旋
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ISSN0256-307X
1741-3540

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Summary:We report a new kagome quantum spin liquid candidate CuaZn（OH）6FBr, which does not experience any phase transition down to 50inK, more than three orders lower than the antiferromagnetic Curie-Weiss temperature （-200 K）. A clear gap opening at low temperature is observed in the uniform spin susceptibility obtained from 19F nuclear magnetic resonance measurements. We observe the characteristic magnetic field dependence of the gap as expected for fractionalized spin-1/2 spinon excitations. Our experimental results provide firm evidence for spin fractionalization in a topologically ordered spin system, resembling charge fraetionalization in the fractional quantum Hall state.
Bibliography:We report a new kagome quantum spin liquid candidate CuaZn（OH）6FBr, which does not experience any phase transition down to 50inK, more than three orders lower than the antiferromagnetic Curie-Weiss temperature （-200 K）. A clear gap opening at low temperature is observed in the uniform spin susceptibility obtained from 19F nuclear magnetic resonance measurements. We observe the characteristic magnetic field dependence of the gap as expected for fractionalized spin-1/2 spinon excitations. Our experimental results provide firm evidence for spin fractionalization in a topologically ordered spin system, resembling charge fraetionalization in the fractional quantum Hall state.
Zili Feng1, Zheng Li1,t, Xin Meng1, Wei Yi1, Yuan Wei1,Jun Zhang3, Yanicheng Wang1, Wei Jiang4, Zheng Liu5, Shiyan Li3,6,Feng Liu4, Jianlin Luo1,2,7, Shiliang Li1,2,7, Guo-qing Zheng1,8, Zi Yang Meng1, Jia-Wei Mei4,9,10, Youguo Shi1 （1Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190 3 State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433 4Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA 5Institute for Advanced Study, Tsinghua University, Beijing 100084 6Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093 7 Collaborative Innovation Center of Quantum Matter, Beijing 100190 8Department of Physics, OkayamaUniversity, Okayama 700-8530, Japan 9Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055 10Beijing Computational Science Research Center, Beijing 100193）
11-1959/O4
ISSN:0256-307X
1741-3540