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Unoccupied electronic structure of Ni2MnGa ferromagnetic shape memory alloy

TitleUnoccupied electronic structure of Ni2MnGa ferromagnetic shape memory alloy
Publication TypeJournal Article
Year of Publication2015
AuthorsManiraj, M, Souza, SW, Rai, A, Schlagel, DL, Lograsso, TA, Chakrabarti, A, Barman, SR
JournalSolid State Communications
Volume222
Pagination1-4
Date Published11
Type of ArticleArticle
ISBN Number0038-1098
Accession NumberWOS:000363819000001
KeywordsFerromagnetic shape memory alloy, Inverse, inverse-photoemission, Korriga-Kohn-Rostoker method, Martensite transition, martensitic, Ni-Mn-Sn, ni2+xmn1-xga, phase, phase-transformation, photoemission spectroscopy, single-crystal, surface, transitions
Abstract

Momentum resolved inverse photoemission spectroscopy measurements show that the dispersion of the unoccupied bands of Ni(2)MaGa is significant in the austenite phase. In the martensite phase, it is markedly reduced, which is possibly related to the structural transition to an incommensurate modulated state in the martensite phase. Based on the first principle calculations of the electronic structure of Ni-Mn-Ga, we show that the modification of the spectral shape with surface composition is related to change in the hybridization between the Mn 3d and Ni 3d-like states that dominate the unoccupied conduction band. (C) 2015 Elsevier Ltd. All rights reserved.

DOI10.1016/j.ssc.2015.08.003
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