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The actinide cubic Laves compounds NpAl2, NpOs2, NpFe2, and PuFe2 have beenexamined by X-ray magnetic circular dichroism (XMCD) at the actinide M4,5absorption edges and Os L2,3 absorption edges. The XMCD experiments performedat the M4,5 absorption edges of Np and Pu allow us to determine thespectroscopic branching ratio, which gives information on the coupling schemein these materials. In all materials the intermediate coupling scheme is foundappropriate. Comparison with the SQUID data for NpOs2 and PuFe2 allows adetermination of the individual orbital and spin magnetic moments and themagnetic dipole contribution mmd. The resulting orbital and spin magneticmoments are in good agreement with earlier values determined by neutrondiffraction, and the values of mmd are non-negligible, and close to thosepredicted for intermediate coupling. There is a comparatively large inducedmoment on the Os atom in NpOs2 such that the Os contribution to the totalmoment per formula unit is ~30% of the total. The spin and orbital moments atthe Os site are parallel, in contrast to the anti-parallel configuration of Osimpurities in 3d ferromagnetic transition metals. Calculations using the LDA+Utechnique are reported. The ab initio computed XMCD spectra show good agreementwith experimental spectra for small values (0-1eV) of the Hubbard U parameter,which underpins that 5f electrons in these compounds are relativelydelocalized.

X-ray magnetic circular dichroism experiments and theory of transuranium Laves phase compounds