查看文章

The electronic structures of have been investigated by using photoemission spectroscopy (PES), soft x-ray absorption spectroscopy, and soft x-ray magnetic circular dichroism (XMCD). Both Mn and Fe ions are found to be nearly tetravalent for the whole range of in . Valence-band PES measurements show the broader bands than the bands and the finite metallic intensity near in the PES of in agreement with the metallic ground state of . The XMCD spectra exhibit the enhanced XMCD effect for in , which is consistent with the spin-glass behavior in the intermediate substitution, while the states exhibit the negligible XMCD effect.