Abstract
Among neptunium compounds NpRhGa 5 crystallizes in a tetragonal HoCoGa 5-type crystal structure and the local magnetic moments of Np site are ordered with a propagation vector q = ( 0 0 1 2 ) in the ground state. Since the antiferromagnetic state is unchanged under a strong magnetic field in a de Haas-van Alphen (dHvA) measurement, the Fermi surface topology of NpRhGa 5 can be investigated for the ordered state. The Fermi surface and the local magnetic moment are calculated using a relativistic spin-polarized LAPW method including an orbital-polarization effect within the local spin-density approximation. The orbital-polarized band scheme based on an itinerant 5f electron can give a value of the magnetic moment consistent with an experimental result. The Fermi surface thus obtained can explain angular dependence of the observed dHvA frequencies, consequently indicating an origin of their branches. The results suggest that the orbital-polarized band method is suitable for studying both the Fermiology and the magnetism in the neptunium compounds.
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