Three-dimensional sandglass magnet with non-Kramers ions

Magnetic susceptibility, specific heat, and muon spin relaxation (??SR) measurements have been performed on a synthesized three-dimensional sandglass-type lattice Tm3SbO7, where two inequivalent sets of non-Kramers 2 ) 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 Tm3SbO7 are dominated by the lowest non-Kramers quasidoublet of Tm3+1 , and the energy splitting is regarded as an intrinsic transverse field. Therefore, the low-temperature paramagnetic phenomenon in Tm3SbO7 is explained by a transverse field Ising model, which is supported by the quantitative simulation of specific heat data. In addition, the perturbation from Tm23+ may play an important role in accounting for the low temperature spin dynamics behavior observed by ??SR.