Magnetism and the observation of NMR lines in hexagonal Al₄Mn and icosahedral Al‐Mn alloys Available to Purchase

Previous measurements of the magnetic susceptibility and the intensity of the ⁵⁵Mn NMR line in a number of periodic and quasiperiodic (i.e., icosahedral) Al‐Mn and Al‐Mn‐Si alloys suggested some correlation, in that the ⁵⁵Mn line intensity decreases as the magnetic susceptibility increases. This correlation had led to the tentative conclusion that the reduction of the ⁵⁵Mn line intensity is due to the magnetism, and that the ‘‘magnetic’’ Mn atoms are not seen in the NMR. We have found that the above correlation breaks down in a very substantial way for hexagonal Al₄Mn which (i) shows a small magnetic susceptibility, and (ii) no observable ⁵⁵Mn line. Thus the reduction in intensity in the ⁵⁵Mn NMR line in the icosahedral phase is not necessarily due to its magnetism but may have its origin in another line broadening mechanism.