Phys. Rev. B 77, 115201 (2008) [7 pages]Bulk electronic properties of FeSi1−xGex investigated by high-resolution x-ray spectroscopiesReceived 27 July 2007; revised 6 November 2007; published 5 March 2008 We report an investigation of the bulk electronic properties of Fe in FeSi1−xGex (x=0, 0.11, 0.19, and 0.44) measured by high-resolution x-ray absorption spectroscopy at the Fe K edge, Fe Kβ x-ray emission, and 1s3p resonant x-ray emission spectroscopies. The emission data clearly show an increase in the magnetic moment when x increases from 0 to 0.44. This doping-induced spin transition is accompanied by the onset of the magnetic order at x⩾0.2. The 1s3p resonant x-ray emission data reveal that the Fe 3d states exhibit a delocalized character, while no intermediate valence admixture takes place. This is at odd with the intermediate valence Kondo insulator model and rather supports the local density approximation band theory. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.115201
DOI:
10.1103/PhysRevB.77.115201
PACS:
75.30.Mb, 61.05.cj, 71.20.Eh, 78.70.Ck
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