Abstract

The magnetic and electronic properties of NpX 2 (X = Ga, Si) were studied by Mössbauer and ac-dc magnetization techniques. Both order ferromagnetically below T C = 55(2) and 48(2) K respectively. A comparison of our data with the results for other NpX 2 (X = Al, As, Sb, Te) compounds indicates that NpGa 2 is a highly localized 5f electron system, whereas in NpSi 2 the 5f electrons are partially delocalized. The magnetic properties of NpX 2 compounds can neither be consistently explained within the conventional crystal electric field picture (CEF) nor by taking into account hybridization dressing or local spin density models.

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