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We have revealed the underlying mechanism of the martensitic phase transition (MPT) in a new class of ferromagnetic shape memory alloys, Ni 2 Mn 1þx Sn 1Àx , by the combination of bulk-sensitive hard-x-ray photoelectron spectroscopy and a first-principles density-functional calculation. The Ni 3d e g state in the cubic phase systematically shifts towards the Fermi energy with an increase in the number of Mn atoms substituted in the Sn sites. An abrupt decrease of the intensity of the Ni 3d e gdoi:10.1103/physrevlett.104.176401 pmid:20482119 fatcat:hgcg6yjfinf3lklep5ggruwltu