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  • Letter

Possible Dirac quantum spin liquid in the kagome quantum antiferromagnet YCu3(OH)6Br2[Brx(OH)1−x]

Zhenyuan Zeng1,2, Xiaoyan Ma1,2, Si Wu3, Hai-Feng Li3,*, Zhen Tao4, Xingye Lu4, Xiao-hui Chen5, Jin-Xiao Mi5, Shi-Jie Song6 et al.

Guang-Han Cao6,7,8, Guangwei Che9, Kuo Li9, Gang Li1,10, Huiqian Luo1,10, Zi Yang Meng1,11, 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 of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macao SAR 999078, China
  • 4Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
  • 5Fujian Provincial Key Laboratory of Advanced Materials (Xiamen University), Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
  • 6Department of Physics, Zhejiang University, Hangzhou 310027, China
  • 7Zhejiang Province Key Laboratory of Quantum Technology and Devices, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, China
  • 8Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 9Center for High Pressure Science and Technology Advanced Research, 10 Xibeiwang East Road, Haidian, Beijing 100094, China
  • 10Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
  • 11Department of Physics and HKU-UCAS Joint Institute of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China

  • *haifengli@um.edu.mo
  • †slli@iphy.ac.cn

Phys. Rev. B 105, L121109 – Published 15 March, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L121109

Abstract

We studied the magnetic properties of YCu3(OH)6Br2[Br1−x(OH)x] (x = 0.33), where Cu2+ ions form two-dimensional kagome layers. There is no magnetic order down to 50 mK, while the Curie-Weiss temperature is on the order of −100 K. At zero magnetic field, the low-temperature specific heat shows a T2 dependence. Above 2 T, a linear temperature dependence term in specific heat emerges, and the value of γ=C/T increases linearly with the field. Furthermore, the magnetic susceptibility tends to a constant value at T=0. Our results suggest that the magnetic ground state of YCu3(OH)6Br2[Br1−x(OH)x] is consistent with a Dirac quantum-spin-liquid state with a linearly dispersing spinon strongly coupled to an emergent gauge field, which has long been theoretically proposed as a candidate ground state in the two-dimensional kagome Heisenberg antiferromagnetic system.

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