Muon Spin Relaxation Study of Frustrated Tm3Sb3Mg2O14 with Kagome Lattice

The structure and magnetic properties of rare-earth ions Tm3+ Kagome lattice Tm3Sb3Mg2O14 are studied by x-ray diffraction, magnetic susceptibility and muon spin relaxation (mu SR) experiments. The existence of a small amount of Tm/Mg site-mixing disorder is revealed. DC magnetic susceptibility measurement shows that Tm3+ magnetic moments are antiferromagnetically correlated with a negative Curie-Weiss temperature of -26.3 K. Neither long-range magnetic order nor spin-glass transition is observed by DC and AC magnetic susceptibility, and confirmed by mu SR experiment down to 0.1 K. However, the emergence of short-range magnetic order is indicated by the zero-field mu SR experiments, and the absence of spin dynamics at low temperatures is evidenced by the longitudinal-field mu SR technique. Compared with the results of Tm3Sb3Zn2O14, another Tm-based Kagome lattice with much more site-mixing disorder, the gapless spin liquid like behaviors in Tm3Sb3Zn2O14 can be induced by disorder effect. Samples with perfect geometrical frustration are in urgent demand to establish whether QSL exists in this kind of materials with rare-earth Kagome lattice.