Martensitic transition, ferrimagnetism and Fermi surface nesting in Mn_2NiGa

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.

Euro Physics Letters (accepted)

References in corpus (8)

• Inverse magnetocaloric effect in ferromagnetic Ni-Mn-Sn alloys
• Coexistence of ferro- and antiferromagnetic order in Mn-doped Ni${}_2$MnGa
• First-principles study of lattice instabilities in the ferromagnetic martensite Ni${}_2$MnGa
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• Soft tetragonal distortions in ferromagnetic Ni_2MnGa and related materials from first principles
• A First-Principles Investigation of Phonon Softenings and Lattice Instabilities in the Shape-Memory System Ni${}_2$MnGa
• Influence of Ni doping on the electronic structure of Ni_2MnGa
• Observation of Phasons in Magnetic Shape Memory Alloy Ni2MnGa

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• Probing the possibility of coexistence of martensite transition and half-metallicity in Ni and Co-based full Heusler Alloys : An ab initio Calculation
• Magnetoresistance behavior of a ferromagnetic shape memory alloy: Ni_1.75Mn_1.25Ga
• Ab initio Studies on Electronic and Magnetic Properties of X${}_2$PtGa (X = Cr, Mn, Fe, Co) Heusler Alloys
• Interplay of phase sequence and electronic structure in the modulated martensites of Mn${}_2$NiGa from first-principles
• Effect of Fe and Co substitution on martensitic stability, elastic, electronic and magnetic properties of Mn${}_2$NiGa: insights from \textit{ab initio} calculations
• Magnetic properties and electronic structure of Mn-Ni-Ga magnetic shape memory alloys
• First-principles study of the lattice instabilities in Mn${}_2$Ni{\it X} ({\it X}= Al, Ga, In, Sn) magnetic shape memory alloys
• Magnetic interactions in the Martensitic phase of Mn rich Ni-Mn-In shape memory alloys
• Effect of site occupancy disorder on Martensitic properties of Mn${}_2$NiIn type alloys: x-ray absorption fine structure study