Phase diagram and electronic structure of Ni2+xMn1−xGa

Banik, S. ; Chakrabarti, Aparna ; Kumar, U. ; Mukhopadhyay, P. K. ; Awasthi, A. M. ; Ranjan, R. ; Schneider, J. ; Ahuja, B. L. ; Barman, S. R. (2006) Phase diagram and electronic structure of Ni2+xMn1−xGa Physical Review B: Condensed Matter and Materials Physics, 74 (8). 085110_1-085110_7. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v74/i8/e085110

Related URL: http://dx.doi.org/10.1103/PhysRevB.74.085110

Abstract

We determine the phase diagram of Ni2+xMn1−xGa as a function of x (0<x0.35) from ac susceptibility and differential scanning calorimetry (DSC). Total energy and density of states calculated using the ab initio full potential linearized plane-wave (FPLAPW) method explain the phase diagram. A martensitic paramagnetic phase for x>0.2 has been identified. The structure of this phase is found to be tetragonal from high-temperature x-ray-diffraction (XRD) studies. XRD, magnetization, and DSC measurements show that the paramagnetic tetragonal phase evolves from the lower temperature ferromagnetic tetragonal phase through a second-order phase transition without any change of structure. The unoccupied conduction band has been studied by inverse photoemission spectroscopy. It is dominated by Mn 3d-like states, and is in good agreement with FPLAPW based calculations.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:64583
Deposited On:12 Oct 2011 05:20
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