Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn_2NiGa

Details Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn_2NiGa Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn_2NiGa

2007-07-14

arxiv.org/abs/0707.2133v2

Physics

Condensed Matter

Other Condensed Matter

Euro Physics Letters (accepted)

Scientific paper

10.1209/0295-5075/80/57002

The electronic structure of Mn_2NiGa has been studied using density functional theory and photoemission spectroscopy. The lower temperature tetragonal martensitic phase with c/a= 1.25 is more stable compared to the higher temperature austenitic phase. Mn_2NiGa is ferrimagnetic in both phases. The calculated valence band spectrum, the optimized lattice constants and the magnetic moments are in good agreement with experiment. The majority-spin Fermi surface (FS) expands in the martensitic phase, while the minority-spin FS shrinks. FS nesting indicates occurrence of phonon softening and modulation in the martensitic phase.

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