Field-tuned quantum effects in a triangular-lattice Ising magnet

• 作者: Yayuan Qin Yao Shen Changle Liu Hongliang Wo Yonghao Gao Yu Feng Xiaowen Zhang Gaofeng Ding Yiqing Gu Qisi Wang Shoudong Shen Helen C.Walker Robert Bewley Jianhui Xu Martin Boehm Paul Steffens Seiko Ohira-Kawamura Naoki Murai Astrid Schneidewind Xin Tong Gang Chen Jun Zhao
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: Physical Sciences
• 页码范围: 38-44
• 页数: 7页
• 语种: 英文

摘要

We report thermodynamic and neutron scattering measurements of the triangular-lattice quantum Ising magnet TmMgGaO4 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 fluc-tuations 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 lsing interactions.