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Influence of Ni doping on the electronic structure of Ni_2MnGa

Research paper by Aparna Chakrabarti, C. Biswas, S. Banik, R. S. Dhaka, A. K. Shukla, S. R. Barman

Indexed on: 29 Jun '05Published on: 29 Jun '05Published in: Physics - Materials Science



Abstract

The modifications in the electronic structure of Ni_{2+x}Mn_{1-x}Ga by Ni doping have been studied using full potential linearized augmented plane wave method and ultra-violet photoemission spectroscopy. Ni 3d related electron states appear due to formation of Ni clusters. We show the possibility of changing the minority-spin DOS with Ni doping, while the majority-spin DOS remains almost unchanged. The total magnetic moment decreases with excess Ni. The total energy calculations corroborate the experimentally reported changes in the Curie temperature and the martensitic transition temperature with x.