We succeeded in growing a high-quality NpCoGa5 single crystal by the Ga-flux method and measured its electrical resistivity, specific heat, magnetic susceptibility and magnetization. NpCoGa5 is an antiferromagnet with a Néel temperature of 47 K. The magnetic moment of Np is directed along the  direction of a tetragonal crystal structure. A sharp metamagnetic transition was observed at Hm = 43 kOe for H ∥ , where the antiferromagnetic state is changed to the paramagnetic state above Hm. The ordered moment was determined to be 0.74 μB/Np. The magnetic properties were discussed on the basis of the crystalline electric field scheme of the 5f4 configuration.
ASJC Scopus subject areas
- Physics and Astronomy(all)