The magnetic ground state of geometrically frustrated antiferromagnet attracts great research interests due to the possibility to realize novel quantum magnetic state such as a quantum spin liquid. Here we present a comprehensive magnetic characterization of DyTa7O19 with ideal two-dimensional triangular lattice. DyTa7O19 exhibits c-axis single-ion magnetic anisotropy. Although long-range magnetic order is not observed down to 100 mK under zero field, by applying a small magnetic field (∼0.1 T), a magnetically ordered state with net magnetization of Ms/3 below Tm=0.14 K is identified (Ms denotes the saturated magnetization). We argue that this state is an up-up-down magnetic structure phase driven by the dipole-dipole interactions between Ising-like spins of Dy3+ in a two-dimensional triangular lattice, since its ordering temperature and temperature-field phase diagram can be well explained by the theoretical calculations based on dipolar interactions. DyTa7O19 could be viewed as a rare material platform that realizing pure Ising-like dipolar interaction in a geometrically frustrated lattice.
@article{arxiv.2506.06047,
title = {Field-induced magnetic order in DyTa$_7$O$_{19}$ with two-dimensional pseudospin-$\frac{1}{2}$ triangular lattice},
author = {Feihao Pan and Nan Zhao and Songnan Sun and Chenglin Shang and Peng Cheng and Jieming Sheng and Liusuo Wu},
journal= {arXiv preprint arXiv:2506.06047},
year = {2025}
}