Antiferromagnetic Kondo lattice NpNi 2 Sn

The compound NpNi2Sn has been studied by means of x-ray diffraction, heat capacity, magnetic and electrical transport measurements performed over a wide range of temperatures and applied magnetic fields. The results revealed Kondo-lattice behavior and antiferromagnetic ordering below the Neel temperature of 13 K. The compound has been characterized as a moderately enhanced heavy-fermion system, one of very few known amidst Np-based intermetallics.