Three-dimensional sandglass magnet with non-Kramers ions

Magnetic susceptibility, specific heat, and muon spin relaxation ($\ensuremath{\mu}\mathrm{SR}$) measurements have been performed on a synthesized three-dimensional sandglass-type lattice ${\mathrm{Tm}}_{3}{\mathrm{SbO}}_{7}$, where two inequivalent sets of non-Kramers ${\mathrm{Tm}}^{3+}$ ions (${\mathrm{Tm}}_{1}^{3+}$ ${\mathrm{Tm}}_{2}^{3+})$ show crystal electrical field effect at different temperature ranges. The existence an ordered or glassy state down to 0.1 K in zero is excluded. low-energy properties ${\mathrm{Tm}}_{3}{\mathrm{SbO}}_{7}$ are dominated by the lowest quasidoublet ${\mathrm{Tm}}_{1}^{3+}$, energy splitting regarded as intrinsic transverse field. Therefore, low-temperature paramagnetic phenomenon explained Ising model, which supported quantitative simulation heat data. In addition, perturbation from ${\mathrm{Tm}}_{2}^{3+}$ may play important role accounting for low dynamics behavior observed $\ensuremath{\mu}\mathrm{SR}$.