Anomalous magnetism in decagonalAl69.8Pd12.1Mn18.1
作者： D. Rau , J. L. Gavilano , Sh. Mushkolaj , C. Beeli , M. A. Chernikov
DOI: 10.1103/PHYSREVB.68.134204
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摘要: We report the results of measurements $^{27}$Al and $^{55}$Mn NMR spectra, related spin-lattice relaxation rates, dc magnetic susceptibility stable decagonal quasicrystal Al$_{69.8}$Pd$_{12.1}$Mn$_{18.2}$. The temperature-variation $\chi(T)$ reveals that Mn ions carry only an average moment approximately $2\mu_{\mathrm{B}}$, confirms a spin-glass type freezing Mn-moments at $T_f=12$K. spectra reveal two partially resolved lines for $^{27}$Al-nuclei, indicating there are different sets environments Al-sites. integrated intensity line in suggests about half no moment. Below 50K, upon decreasing temperature, NMR-linewidth $w$ rate $T_1^{-1}$ both grow with increasingly negative slope, as it is often observed interpreted critical "slowing down" moments systems approaching transition. Various features, such broad maximum $T_1^{-1}(T)$ slope change $w(\chi)$ plot, around 120K, suggest gradual reduction number temperature below 120K.
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