Magnetic resonance of Gd IN LaNi5 and LaNi5 hydride

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Abstract
The influence of hydrogen uptake on the magnetic properties of LaNi5 has been investigated by observing the electron spin resonance of small amounts of Gd substituted for La. Hydrogenation causes a large exchange induced g‐shift to decrease very strongly in magnitude and to reverse sign. Only ESR signals corresponding to the unhydrided or fully states are observed, indicating very little range of solid solutions. These results are similar to the case of ESR of Gd aND Mn in the Pd, H system but some distinction are drawn. In particular appreciable microwave loss in fully hydrided LaNi5 shows it to be only weakly conducting rather tham metallic. Repeated hydrogenation cycles produce an increasingly intense ferromagnetic resonance signal suggesting precipitation of metallic Ni.

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