Magnetic anisotropy on the single crystal UNi4B probed by 11B NMR

We have performed a susceptibility $M/H$ and ¹¹B NMR measurements to investigate the static magnetic anisotropy of a single crystal UNi₄B. The Knight shift ¹¹K and the hyperfine coupling constant $A_{\mathrm{hf}}$ evaluated by ¹¹K-$M/H$ plot show anisotropic behavior between $H\parallel \left[11\overline{2}0\right]$ and $H\parallel \left[0001\right]$, reflecting the bulk susceptibility. The evaluated transferred term $A_{\mathrm{tr}}$ of $A_{\mathrm{hf}}$ for $H\parallel \left[11\overline{2}0\right]$ is much larger than the one for $H\parallel \left[0001\right]$. The strong hybridization in the [0001]-plane due to a itinerant 5f-electron is strongly associated with the unique magnetic structure in this compound.