Abstract
A local spectroscopic study of the distribution of inequivalent lattice sites in icosahedral ${\mathrm{Al}}_{72.4}{\mathrm{Pd}}_{20.5}{\mathrm{Mn}}_{7.1}$ single-grain quasicrystal by the ${}^{27}\mathrm{Al}$ quadrupole-perturbed NMR is presented. The strongly inhomogeneously broadened ${}^{27}\mathrm{Al}$ spectra show orientation dependence in the magnetic field that originates from a spatially anisotropic distribution of the electric-field gradient tensor orientations at inequivalent lattice sites. The results give spectroscopic evidence that some local atomic arrangements in the quasiperiodic structure are preferred within the manifold of the infinitely many inequivalent lattice sites.
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