Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-021-24257-8
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Funding
- National Natural Science Foundation of China [11834014, 11974036, 11974421, 11804401]
- Ministry of Science and Technology of China [2016YFA0300504]
- Fundamental Research Funds for the Central Universities [BeihangU-ZG216S2113, SYSU-2021qntd27]
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Researchers have used multiple state-of-the-art many-body methods to determine the microscopic spin model that quantitatively explains major observations in alpha -RuCl3, including the characteristic structures and field-induced quantum phases.
The frustrated magnet alpha -RuCl3 constitutes a fascinating quantum material platform that harbors the intriguing Kitaev physics. However, a consensus on its intricate spin interactions and field-induced quantum phases has not been reached yet. Here we exploit multiple state-of-the-art many-body methods and determine the microscopic spin model that quantitatively explains major observations in alpha -RuCl3, including the zigzag order, double-peak specific heat, magnetic anisotropy, and the characteristic M-star dynamical spin structure, etc. According to our model simulations, the in-plane field drives the system into the polarized phase at about 7 T and a thermal fractionalization occurs at finite temperature, reconciling observations in different experiments. Under out-of-plane fields, the zigzag order is suppressed at 35 T, above which, and below a polarization field of 100 T level, there emerges a field-induced quantum spin liquid. The fractional entropy and algebraic low-temperature specific heat unveil the nature of a gapless spin liquid, which can be explored in high-field measurements on alpha -RuCl3. The nature of spin interactions and the field-induced quantum spin liquid phase in the Kitaev material alpha -RuCl3 have been debated. Here, using a combination of many-body techniques, the authors derive an effective spin model that explains the majority of experimental findings and predicts a new quantum spin liquid phase in strong out-of-plane magnetic field.
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