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    STUDIA PHYSICA - Issue no. 1 / 2009  
         
  Article:   CRYSTALLOGRAPHIC AND ELECTRONIC STRUCTURE OF NI0.7-XALXMN0.3 ALLOYS.

Authors:  V. REDNIC, M. COLDEA, O. ISNARD, M. NEUMANN, L. REDNIC.
 
       
         
  Abstract:  X-ray diffraction and photoelectron spectroscopy measurements of Ni0.7-xAlxMn0.3 (x=0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.7) alloys are reported. A change in the crystallographic structure takes place around x=0.2 from AuCu3 to CsCl (B2) structure type. The decrease of the Ni 2p satellites as the Al concentration increases may be explained by the hybridization of the Ni 3d and Al 3sp states, which leads to a partial filling of the Ni 3d band. The Ni 2p core level lines and the valence band centroids are shifted towards higher binding energies and the density of states at Fermi level decreases as the Al concentration increases, confirming the partial filling of the Ni 3d band. XPS core-level spectra evidenced the existence of local magnetic moments confined at Mn sites.

Keywords: transition metal, alloy, magnetic measurements, XPS spectra, local moments
 
         
     
         
         
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