Three-dimensional Sandglass Magnet with Non-Kramers ions

Abstract

Magnetic susceptibility, specific heat, and muon spin relaxation ($\mu$SR) measurements have been performed on a newly synthesized three-dimensional sandglass-type lattice Tm${}_3$SbO${}_7$, where two inequivalent sets of non-Kramers Tm${}^{3+}$ ions (Tm${}_1^{3+}$ and Tm${}_2^{3+})$ show crystal electrical field effect at different temperature ranges. The existence of an ordered or a glassy state down to 0.1~K in zero field is excluded. The low-energy properties of Tm${}_3$SbO${}_7$ are dominated by the lowest non-Kramers quasi-doublet of $\mathrm{T}{\mathrm{m}}_1^{3+}$, and the energy splitting is regarded as an intrinsic transverse field. Therefore, the low-temperature paramagnetic phenomenon in Tm${}_3$SbO${}_7$ is explained by a transverse field Ising model, which is supported by the quantitative simulation of specific heat data. In addition, the perturbation from Tm${}_2^{3+}$ may play an important role in accounting for the low temperature spin dynamics behavior observed by $\mu$SR.

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