Figure 1

(a) A schematic diagram of the [111] and $[1\overline{1}0]$ horizontal scattering plane that was used for our neutron scattering measurements. The external pulsed magnetic field, $H$, was applied horizontally 7° away from the [111] direction as shown by an arrow. The open circles represent commensurate wave vector positions, and the filled circles represent the (0, $\delta$, 1) incommensurate magnetic Bragg positions observed for zero magnetic field. (b) Our elastic neutron scattering data taken with $H=0$ at 2 K along the ($1.04+h$, $-1.04+h$, $h$) as shown by an arrow in (a).Reuse & Permissions

Figure 2

Time dependence of the magnetic field [solid (red) lines] and neutron counts (●) measured at (1.0675, $-1.0125$, 0.0275) and (1, $-1$, 0) reflections at the initial temperature $T=2.5\mathrm{K}$. The corresponding magnetic field is shown on the right $y$ axis. The measurements were performed over 200 and 150 magnetic-field pulses for (1.0675, $-1.0125$, 0.0275) and (1, $-1$, 0) reflections, respectively, and the data were summed. Binning times were 200 and $80\mu \mathrm{s}$ for (1.0675, $-1.0125$, 0.0275) and (1, $-1$, 0) reflections, respectively. The vertical dotted lines are drawn at the times corresponding nominally to the critical field, $H_c=28\mathrm{T}$. The horizontal dashed lines represent the background levels determined at wave vectors away from the reflection positions. The gray thick lines are guides for the eye.Reuse & Permissions

Figure 3

Magnetic-field dependence of the peak intensity of the (a) (1.0675, $-1.0125$, 0.0275), (b) (1, $-1$, 0), and (c) (2, $-2$, 0) reflections measured at $T=2.5\mathrm{K}$ with the ascending (●) and descending (○) field. For better statistics, binning times were 200, 80, and $80\mu \mathrm{s}$ for (1.0675, $-1.0125$, 0.0275), (1, $-1$, 0), and (2, $-2$, 0) reflections, respectively. The vertical dotted lines are drawn at the times corresponding nominally to the critical field, $H_c=28\mathrm{T}$. The horizontal dashed lines represent background intensity.Reuse & Permissions

Figure 4

Magnetic structures with cubic $P{4}_{3}32$ (a) and rhombohedral $R\overline{3}m$ (b) symmetries. Open and filled circles represent up and down spins, respectively. Each tetrahedron has three up and one down spins.Reuse & Permissions