Paramagnetic NMR relaxation in icosahedral quasicrystals

The nuclear spin-lattice relaxation in icosahedral quasicrystals containing magnetic transition-metal atoms is governed by two mechanisms of competing strength: the relaxation via conduction electrons and the relaxation via paramagnetic centers in combination with spin diffusion. The Al-27 NMR relaxation experiments on icosahedral AlPdMn and AlCuFe have shown that the paramagnetic relaxation dominates at temperatures below 100.