Author
Listed:
- Ze Hu
(Renmin University of China)
- Zhen Ma
(Nanjing University
Hubei Normal University)
- Yuan-Da Liao
(Chinese Academy of Sciences
University of Chinese Academy of Sciences)
- Han Li
(Beihang University)
- Chunsheng Ma
(Renmin University of China)
- Yi Cui
(Renmin University of China)
- Yanyan Shangguan
(Nanjing University)
- Zhentao Huang
(Nanjing University)
- Yang Qi
(Fudan University
Fudan University
Nanjing University)
- Wei Li
(Beihang University
Beihang University)
- Zi Yang Meng
(Chinese Academy of Sciences
The University of Hong Kong, Pokfulam Road
Songshan Lake Materials Laboratory)
- Jinsheng Wen
(Nanjing University
Nanjing University)
- Weiqiang Yu
(Renmin University of China)
Abstract
The Berezinskii-Kosterlitz-Thouless (BKT) mechanism, building upon proliferation of topological defects in 2D systems, is the first example of phase transition beyond the Landau-Ginzburg paradigm of symmetry breaking. Such a topological phase transition has long been sought yet undiscovered directly in magnetic materials. Here, we pin down two transitions that bound a BKT phase in an ideal 2D frustrated magnet TmMgGaO4, via nuclear magnetic resonance under in-plane magnetic fields, which do not disturb the low-energy electronic states and allow BKT fluctuations to be detected sensitively. Moreover, by applying out-of-plane fields, we find a critical scaling behavior of the magnetic susceptibility expected for the BKT transition. The experimental findings can be explained by quantum Monte Carlo simulations applied on an accurate triangular-lattice Ising model of the compound which hosts a BKT phase. These results provide a concrete example for the BKT phase and offer an ideal platform for future investigations on the BKT physics in magnetic materials.
Suggested Citation
Ze Hu & Zhen Ma & Yuan-Da Liao & Han Li & Chunsheng Ma & Yi Cui & Yanyan Shangguan & Zhentao Huang & Yang Qi & Wei Li & Zi Yang Meng & Jinsheng Wen & Weiqiang Yu, 2020.
"Evidence of the Berezinskii-Kosterlitz-Thouless phase in a frustrated magnet,"
Nature Communications, Nature, vol. 11(1), pages 1-6, December.
Handle:
RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19380-x
DOI: 10.1038/s41467-020-19380-x
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