Field-induced magnetic order in DyTa 7 O 19 with two-dimensional pseudospin- 1 2 triangular lattice

Le résumé fourni par la source

The magnetic ground state of geometrically frustrated antiferromagnets has attracted great research interest due to the possibility to realize novel quantum magnetic states such as a quantum spin liquid. Here we present a comprehensive magnetic characterization of ${\mathrm{DyTa}}_{7}{\mathrm{O}}_{19}$ with an ideal two-dimensional triangular lattice. ${\mathrm{DyTa}}_{7}{\mathrm{O}}_{19}$ 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 ($\ensuremath{\sim}0.1$ T), a magnetically ordered state with net magnetization of ${M}_{s}/3$ below ${T}_{m}=0.14\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ is identified (${M}_{s}$ 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 ${\mathrm{Dy}}^{3+}$ 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. ${\mathrm{DyTa}}_{7}{\mathrm{O}}_{19}$ could be viewed as a rare material platform that realizes pure Ising-like dipolar interaction in a geometrically frustrated lattice.

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