Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn2NiGa

被引：92
|
作者：
Barman, S. R. [1 ]
Banik, S. [1 ]
Shukla, A. K. [1 ]
Kamal, C. [2 ]
Chakrabarti, Aparna [2 ]
机构：
[1] UGC DAE Consortium Sci Res, Indore 452017, Madhya Pradesh, India
[2] Raja Ramana Ctr Adv Technol, Indore 452013, Madhya Pradesh, India
来源：
EPL | 2007年 / 80卷 / 05期
关键词：
D O I：
10.1209/0295-5075/80/57002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The electronic structure of Mn2NiGa 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. 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. Copyright (C) EPLA, 2007.
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页数：6
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