| Issue |
EPL
Volume 80, Number 5, December 2007
|
|
|---|---|---|
| Article Number | 57002 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/80/57002 | |
| Published online | 30 October 2007 | |
Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn2NiGa
1
UGC-DAE Consortium for Scientific Research - Indore, 452017, Madhya Pradesh, India
2
Raja Ramanna Centre for Advanced Technology - Indore, 452013, Madhya Pradesh, India
Received:
7
August
2007
Accepted:
5
October
2007
The electronic structure of Mn2NiGa has been studied using density functional theory and photoemission spectroscopy. The lower-temperature tetragonal martensitic phase with 
= 1.25 is more stable compared to the higher-temperature austenitic phase. Mn2NiGa 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.
PACS: 71.20.Be – Transition metals and alloys / 71.18.+y – Fermi surface: calculations and measurements; effective mass, g factor / 81.30.Kf – Martensitic transformations
© Europhysics Letters Association, 2007
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