Abstract
We have investigated the magnetic electronic structures of PtMnSb, NiMnSb, ${\mathrm{Ni}}_{2}\mathrm{MnSb},$MnSb, MnAlGe, and ${\mathrm{Mn}}_{2}\mathrm{Sb}$ by soft-x-ray absorption spectroscopy (XAS) and magnetic circular dichroism (MCD) measurements in the Mn $2p$ core absorption region. Different degrees of the electron itinerancy of the Mn $3d$ states are discussed. The large orbital angular momentum of the Mn $3d$ electrons is revealed for MnSb by the MCD spectrum. In addition, the XAS and MCD spectra are measured in the Sb $3d,$ Ni $2p,$ and Pt $4f$ core excitation regions. An induced magnetic moment of Sb valence orbitals with the spin antiparallel to that of Mn is clearly indicated for NiMnSb and ${\mathrm{Mn}}_{2}\mathrm{Sb}.$
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