Abstract
We succeeded in growing a high-quality NpCoGa 5 single crystal by the Ga-flux method and measured its electrical resistivity, specific heat, magnetic susceptibility and magnetization. NpCoGa 5 is an antiferromagnet with a Neel temperature of 47 K. The magnetic moment of Np is directed along the [001] direction of a tetragonal crystal structure. A sharp metamagnetic transition was observed at H m =43 kOe for H ∥[001], where the antiferromagnetic state is changed to the paramagnetic state above H m . The ordered moment was determined to be 0.74 µ B /Np. The magnetic properties were discussed on the basis of the crystalline electric field scheme of the 5 f 4 configuration.
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