Muon spin relaxation study of spin dynamics on a Kitaev honeycomb material H3LiIr2O6
The vacancy effect in quantum spin liquid (QSL) has been extensively studied. A finite density of random vacancies in the Kitaev model can lead to a pileup of low-energy density of states (DOS), which is generally experimentally determined by a scaling behavior of thermodynamic or magnetization quantities. Here, we report detailed muon spin relaxation (μSR) results of H3LiIr2O6, a Kitaev QSL candidate with vacancies. The absence of magnetic order is confirmed down to 80 mK, and the spin fluctuations are found to be persistent at low temperatures. Intriguingly, the time-field scaling law of longitudinal-field (LF)-μSR polarization is observed down to 0.1 K. This indicates a dynamical scaling, whose critical exponent of 0.46 is excellently consistent with the scaling behavior of specific heat and magnetization data. All the observations point to the finite DOS with the form $$N(E)\sim {E}^{-\nu }$$ , which is expected for the Kitaev QSL in the presence of vacancies. Our μSR study provides a dynamical fingerprint of the power-law low-energy DOS and introduces a crucial new insight into the vacancy effect in QSL.
Authors
- Qiong Wu (ORCID: https://orcid.org/0000-0003-3598-5789)
- K. W. Chen (ORCID: https://orcid.org/0000-0001-9834-5856)
- C. S. Chen (ORCID: https://orcid.org/0000-0003-2963-2995)
- Lei Shu
- Zihao Zhu (ORCID: https://orcid.org/0000-0001-7793-3026)
- Yanxing Yang
- Cheng Tan (ORCID: https://orcid.org/0000-0002-3164-9705)
- A. D. Hillier (ORCID: https://orcid.org/0000-0002-2391-8581)
- Jia‐Wei Mei (ORCID: https://orcid.org/0000-0003-4933-4880)
- Le Wang (ORCID: https://orcid.org/0000-0002-1962-3510)
- Fei Ye (ORCID: https://orcid.org/0000-0002-0546-0239)
- Cai Liu (ORCID: https://orcid.org/0000-0001-5371-112X)
- Zhaofeng Ding (ORCID: https://orcid.org/0000-0002-9427-4808)
- Chengyu Jiang (ORCID: https://orcid.org/0009-0000-9612-9797)
- Youguo Shi
- Lianglong Huang
- Pabi K. Biswas
Institutions
- Rutherford Appleton Laboratory (GB)
- Fudan University (CN)
- Southern University of Science and Technology (CN)
- Institute of Physics (CN)
- University of Chinese Academy of Sciences (CN)
- State Key Laboratory of Surface Physics
Publication Details
- Journal
- npj Quantum Materials
- Published
- 2024-10-11
- DOI
- https://doi.org/10.1038/s41535-024-00691-x
- Citations
- 6
- Primary Topic
- Advanced Condensed Matter Physics
- Type
- article
- Field-Weighted Citation Impact
- 1.87
Funders
- National Natural Science Foundation of China
- Fudan University
- Southern University of Science and Technology
- Shenzhen Fundamental Research Program