Abstract
The nuclear magnetic resonance and relaxation measurements have been performed for the pseudobinary Y(Mn 1− x M x 2 system whose magnetism strongly depends upon the element M. Pure YMn 2 undergoes a first-order phase transition from the high temperature paramagnetic state with small susceptibilities to the low temperature antiferromagnetic state with the Mn moment of 2.7μ B. The NMR results can be described by the localized moment model for M = Al, both in the paramagnetic and the ordered states. For M = Fe and Co, the Mn moment shrinks largely and the results of NMR suggest that these alloys are weakly itinerant antiferromagnets. Different behavior of the Mn may be related to the atomic spacing of Mn in these systems.
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