2020/11/30 by Yayuan Qin, Yao Shen, Changle Liu +24
Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Excitation #Ferromagnetism #Hexagonal lattice #Ising model #Magnon #Neutron scattering #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum fluctuation #Quantum many-body systems #Quantum mechanics #Scattering #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1016/j.scib.2021.08.012
published as Science Bulletin 67, 38-44 (2022) · Published version
openalex publication_date 2021/08/24 · arxiv created 2021/09/13 · arxiv updated 2021/12/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report thermodynamic and neutron scattering measurements of the triangular-lattice quantum Ising magnet TmMgGaO 4 in longitudinal magnetic fields. Our experiments reveal a quasi-plateau state induced by quantum fluctuations. This state exhibits an unconventional non-monotonic field and temperature dependence of the magnetic order and excitation gap. In the high field regime where the quantum fluctuations are largely suppressed, we observed a disordered state with coherent magnon-like excitations despite the suppression of the spin excitation intensity. Through detailed semi-classical calculations, we are able to understand these behaviors quantitatively from the subtle competition between quantum fluctuations and frustrated Ising interactions.