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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