Electronic structure and x-ray magnetic circular dichroism in Cu3Au-type transition metal platinum alloys - art. no. 024402

The electronic structure and x-ray magnetic circular dichroism (XMCD) in XP t3 (X = V, Cr, Mn, Fe, Co, Ni) and X3Pt (X= Fe, Co, Ni) compounds are inves tigated theoretically from first principles, using the fully relativistic D irac LMTO band structure method. The electronic structure is obtained with the local spin-density approximation (LSDA). Theoretically calculated spin and orbital magnetic moments are found to be in good agreement with neutron and XMCD experimental data. An interpretation for systematic trends seen i n the orbital and spin magnetic moments of the series XPt3 is presented by analyzing the calculated spin- and orbital-projected density of d states. T he important role of hybridization between the 3d transition metal and Pt d states in the formation of the orbital magnetic moments at the Pt site is emphasized. The x-ray absorption spectra as well as the x-ray circular magn etic dichroism at the K, L-2,L-3, and M-2,M-3 edges for transition metal si tes and L-2,L-3, M-2,M-3, M-4,M-5, N-2,N-3, N-4,N-5, N-6,N-7, and O-2,O-3 e dges for Pt sites are calculated for all nine compounds. Good agreement bet ween theory and the experiment is obtained. The XMCD sum rules are used to compute the spin and orbital magnetic moments and the results are compared to the direct calculations.