论文标题
SM $ _3 $ bwo $ _9 $与扭曲的kagome lattice in SM $ _3 $ _9
Incommensurate magnetic order in Sm$_3$BWO$_9$ with the distorted kagome lattice
论文作者
论文摘要
我们使用扭曲的Kagome晶格研究了SM $ _3 $ bwo $ _9 $的磁接地状态。从特定热的温度依赖性中确定了$ t_n = 0.75 $ k的磁相变。从$^{11} $ b核磁共振（NMR）测量值中，在$ C $轴磁场下，双角型光谱显示出不相关的磁性顺序。而在$ ab $平面内以野外为导向的野外拆分的缺失，这表明严格沿$ c $轴的内部场对内部场的调制不相差。从旋转动力学中，在$ 1/t_1 $的温度依赖性中观察到临界减速行为，其中$μ_0H\ perp c $轴是$μ_0H|| c $ -axis完全不存在。基于$^{11} $ b位点的局部对称性，我们分析了超精细耦合张量，并提出了对可能的磁性结构的两个约束。单离子各向异性应在确定SM $ _3 $ bwo $ _9 $和pr $ _3 $ bwo $ _9 $的对比基态的基础状态中发挥重要作用。
We investigate the magnetic ground state of Sm$_3$BWO$_9$ with the distorted kagome lattice. A magnetic phase transition is identified at $T_N=0.75$ K from the temperature dependence of specific heat. From $^{11}$B 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 $1/T_1$ with $μ_0H\perp c$-axis, which is completely absent in that with $μ_0H||c$-axis. Based on the local symmetry of $^{11}$B 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 Sm$_3$BWO$_9$ and Pr$_3$BWO$_9$.
