Proton NMR in the paramagnetic and magnetically ordered phases of SmH2+x and NdH2+x

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Abstract
The deuteron Knight shift K of SmD2+x and NdD2+x has been measured for various x between −0.15 and +0.15. In the paramagnetic state, K is found to be independent of the deuterium concentration and can be described by a modified Curie‐Weiss law: K = K0+λ/(T−ϑ). On the other hand, the temperature dependence of the line width in SmD2+x is strongly affected by the D concentration, indicating a strong magnetic short‐range order to be present for x?0. For NdD2+x the hyperfine field at the deuteron site could be determined in the ferromagnetic state. It is found to be +0.21 T for x?0 and +0.15 T for x = 0.1. For the first time a zero‐field resonance at the proton site has been measured, the frequency being 16.1 MHz at 1.2 K.