Magnetic diffuse scattering in the Zn-Mg-Ho icosahedral quasicrystal has been studied by neutron scattering over a wide $\mathit{Q}$ range using a single-quasicrystalline sample. It was found that the diffuse scattering obeys the icosahedral symmetry, and appears as satellite peaks of the intense nuclear Bragg reflections. The diffuse-scattering patterns were successfully accounted for by assuming short-range spin correlations in a six-dimensional hypercubic crystal with a magnetic modulation vector $\mathit{q}=(\frac{3}{4},0,0,\frac{1}{2},\frac{3}{4},\frac{1}{2}{)}_{{\mathit{a}}^{*}}.$ A possible origin for the six-dimensional spin correlations is discussed.

• Received 17 May 1999

DOI:https://doi.org/10.1103/PhysRevB.61.476