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19 April 2024 |
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Electronic Structure of FeAl Alloy Studied by Resonant Photoemission Spectroscopy and Ab Initio Calculations | | Debashis Mondal
; Soma Banik
; C. Kamal
; Mangla Nand
; S. N. Jha
; D. M. Phase
; A. K. Sinha
; Aparna Chakrabarti
; A. Banerjee
; Tapas Ganguli
; | | Date: |
23 May 2016 | | Abstract: | Resonant photoemission spectroscopy has been used to investigate the
character of Fe 3d states in FeAl alloy. Fe 3d states have two different
character, first is of itinerant nature located very close to the Fermi level,
and second, is of less itinerant (relatively localized character), located
beyond 2 eV below the Fermi level. These distinct states are clearly
distinguishable in the resonant photoemission data. Comparison between the
results obtained from experiments and first principle based electronic
structure calculation show that the origin of the itinerant character of the Fe
3d states is due to the ordered B2 structure, whereas the relatively less
itinerant (localized) Fe 3d states are from the disorders present in the
sample. The exchange splitting of the Fe 3s core level peak confirms the
presence of local moment in this system. It is found that the itinerant
electrons arise due to the hybridization between Fe 3d and Al 3s-3p states.
Presence of hybridization is observed as a shift in the Al 2p core-level
spectra as well as in the X-ray near edge absorption spectra towards lower
binding energy. Our photoemission results are thus explained by the
co-existence of ordered and disordered phases in the system. | | Source: | arXiv, 1605.6967 | | Services: | Forum | Review | PDF | Favorites | |
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