Abstract
Abstract We report the results of a comparative study of the Mn magnetism in decagonal and icosahedral quasicrystalline Al 69.8 Pd 12.1 Mn 18.2 . We made measurements of 27 Al NMR spectra, the 27 Al spin–lattice relaxation rate, and the DC magnetic susceptibility of the stable decagonal, as well as the metastable icosahedral alloy at varying temperatures. For the decagonal sample we found that at 300 K , less than half of all the Mn ions carry a magnetic moment and that this number decreases even further with decreasing temperatures below 100 K . A spin-glass type freezing transition occurs at T f =12 K . For the icosahedral alloy Al 69.8 Pd 12.1 Mn 18.2 the effective Mn moment is significantly larger than for the decagonal case. The spin-glass freezing sets in at 18 K . The NMR-spectra of the two materials as well as the spin–lattice relaxation rates reveal further differences between the Mn-based magnetic features of icosahedral and decagonal Al 69.8 Pd 12.1 Mn 18.2 .
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