Dynamic fingerprint of fractionalized excitations in single-crystalline Cu3Zn(OH)6FBr

Ying Fu, Miao-Ling Lin, Le Wang, Qiye Liu, Lianglong Huang, Wenrui Jiang, Zhanyang Hao, Cai Liu, Hu Zhang, Xingqiang Shi, Jun Zhang, Junfeng Dai, Dapeng Yu, Fei Ye, Patrick A. Lee, Ping-Heng Tan () and Jia-Wei Mei ()
Additional contact information
Ying Fu: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology
Miao-Ling Lin: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
Le Wang: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology
Qiye Liu: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology
Lianglong Huang: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology
Wenrui Jiang: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology
Zhanyang Hao: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology
Cai Liu: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology
Hu Zhang: College of Physics Science and Technology, Hebei University
Xingqiang Shi: College of Physics Science and Technology, Hebei University
Jun Zhang: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
Junfeng Dai: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology
Dapeng Yu: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology
Fei Ye: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology
Patrick A. Lee: Department of Physics, Massachusetts Institute of Technology
Ping-Heng Tan: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
Jia-Wei Mei: Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Beyond the absence of long-range magnetic orders, the most prominent feature of the elusive quantum spin liquid (QSL) state is the existence of fractionalized spin excitations, i.e., spinons. When the system orders, the spin-wave excitation appears as the bound state of the spinon-antispinon pair. Although scarcely reported, a direct comparison between similar compounds illustrates the evolution from spinon to magnon. Here, we perform the Raman scattering on single crystals of two quantum kagome antiferromagnets, of which one is the kagome QSL candidate Cu3Zn(OH)6FBr, and another is an antiferromagnetically ordered compound EuCu3(OH)6Cl3. In Cu3Zn(OH)6FBr, we identify a unique one spinon-antispinon pair component in the E2g magnetic Raman continuum, providing strong evidence for deconfined spinon excitations. In contrast, a sharp magnon peak emerges from the one-pair spinon continuum in the Eg magnetic Raman response once EuCu3(OH)6Cl3 undergoes the antiferromagnetic order transition. From the comparative Raman studies, we can regard the magnon mode as the spinon-antispinon bound state, and the spinon confinement drives the magnetic ordering.

Date: 2021
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DOI: 10.1038/s41467-021-23381-9

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