⁹Be-NMR measurements were performed using single crystalline SmBe₁₃ in order to investigate a magnetic structure of a low-temperature ordering state microscopically. We observed a spectral broadening in the ordered state, and the broadened spectral shape depends on the magnetic field directions. By comparing the experimentally obtained and simulated NMR spectra for magnetic fields along the cubic [001] and [011] directions, we argue a helical structure with a basal plane tilted from the (001) plane in low-field ordering region under the assumption of a helical with a propagation vector of \((0,0,1/3)\) found in other RBe₁₃ compounds (R = rare earths). Such a tilted helical structure is explained by a combination of an ellipse helical in the (001) plane and a longitudinal magnetic density wave along the [001] direction. Considering a magnetic easy axis parallel to [001] revealed by the magnetization measurements, the peculiar helical structure in SmBe₁₃ may be built on delicate balance among exchange interactions, dipole–dipole interaction, and single-ion magnetic anisotropy due to the crystalline electric field.

中文翻译：

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通过 9Be-NMR 研究探测 SmBe13 中可能具有倾斜螺旋平面的磁性结构

⁹ Be-NMR 测量是使用单晶 SmBe _{13 进行的}，以便从微观上研究低温有序状态的磁结构。我们观察到有序状态下的光谱展宽，展宽的光谱形状取决于磁场方向。通过比较实验获得的和模拟的沿 [001] 和 [011] 方向的磁场的 NMR 谱，我们认为在低场有序区域中基面倾斜的螺旋结构在假设具有传播向量的螺旋\((0,0,1/3)\)在其他 RBe ₁₃化合物（R = 稀土）中发现。这种倾斜的螺旋结构可以通过 (001) 平面中的椭圆螺旋和沿 [001] 方向的纵向磁密度波的组合来解释。考虑到磁化测量揭示的平行于 [001] 的易磁化轴，SmBe _{13 中}特殊的螺旋结构可能建立在交换相互作用、偶极-偶极相互作用和由晶体电场引起的单离子磁各向异性之间的微妙平衡上.