Changes in the Electronic Structure Related to the Ni2MnGa Martensitic Phase Transformation

Résumé du livre

Synchrotron-radiation-based photoelectron spectroscopy has been used to probe the electronic structure of Ni{sub 2}MnGa. In particular, the variation of the valence band at temperatures near the transformation temperature for the martensite has been followed. Two salient results have been obtained. (1) The valence electronic structure does not seem to vary in the temperature region associated with phonon softening (near room temperature). (2) Changes in the electronic structure at the lower (martensitic) transformation temperature (T{sub M}=220K) have been observed, which agree with theoretical density of states calculation. These changes are indicative of Fermi Surface Nesting.