We investigate the magnetic ground state of Sm3BWO9 with the distorted kagome lattice. A magnetic phase transition is identified at TN=0.75 K from the temperature dependence of specific heat. From 11B nuclear magnetic resonance (NMR) measurements, an incommensurate magnetic order is shown by the double-horn type spectra under a c-axis magnetic field. While, absence of line splitting is observed for field oriented within the ab-plane, indicating the incommensurate modulation of the internal field strictly along c-axis. From the spin dynamics, the critical slowing down behavior is observed in the temperature dependence of 1/T1 with μ0H⊥c-axis, which is completely absent in that with μ0H∣∣c-axis. Based on the local symmetry of 11B sites, we analyze the hyperfine coupling tensors and propose two constraints on the possible magnetic structure. The single ion anisotropy should play an important role in the determination of the contrasting ground states of Sm3BWO9 and Pr3BWO9.
@article{arxiv.2205.02448,
title = {Incommensurate magnetic order in Sm$_3$BWO$_9$ with the distorted kagome lattice},
author = {K. Y. Zeng and F. Y. Song and L. S. Ling and W. Tong and Shiliang Li and Z. M. Tian and Long Ma and Li Pi},
journal= {arXiv preprint arXiv:2205.02448},
year = {2022}
}