Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn_2NiGa

S. R. Barman; S. Banik; A. K. Shukla; C. Kamal; Aparna Chakrabarti

doi:10.1209/0295-5075/80/57002

Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn_2NiGa

Other Condensed Matter 2009-11-13 v2

Authors: S. R. Barman , S. Banik , A. K. Shukla , C. Kamal , Aparna Chakrabarti

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Abstract

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.

Keywords

martensitic transition ferrimagnetism Fermi surface nesting Mn$_2$NiGa density functional theory photoemission spectroscopy phonon softening

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@article{arxiv.0707.2133,
  title  = {Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn_2NiGa},
  author = {S. R. Barman and S. Banik and A. K. Shukla and C. Kamal and Aparna Chakrabarti},
  journal= {arXiv preprint arXiv:0707.2133},
  year   = {2009}
}

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Euro Physics Letters (accepted)

Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn_2NiGa

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