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Study of New d0 Half-Metallic Half-Heusler Alloy MgCaB: First-Principles Calculations

  • A. AbadaEmail author
  • N. Marbouh
Original Paper
  • 3 Downloads

Abstract

Using first-principles calculations based on the density functional theory (DFT) within the generalized gradient approximation(GGA) for the exchange correlation potential, we have studied the structural, elastic, electronic, and magnetic properties of new d0 half Heusler alloy MgCaB. We found that MgCaB is energetically, mechanically, and chemically stable in the α phase exhibiting ductile nature with negative cohesive and formation energies confirming the possibility of its synthesis experimentally. Our calculations predicate the half-metallicity of this alloy with total magnetic moment of 1.000 μB per formula unit, well consistent with Slater-Pauling rule (Mtot = (8 –ZtotB). The obtained results show that MgCaB has a majority band gap of 0.834 eV with a half-metallic gap of 0.305 eV. The origin of this gap is well discussed. It was also found that half-Heusler alloy MgCaB is a robust half-metallic with respect to the lattice contraction or dilatation. It preserved its half-metallicity in a wide range of lattice constants of 5.47–7.32 Å, and it is considered as nearly gapless half-metallic ferromagnet for lattice parameters range of 7.32–8.14 Å which makes it a worthwhile candidate for applications in spintronic field.

Keywords

Half-Heusler alloy d0 half-metallic Ferromagnet Elastic properties Gapless half-metallic 

Notes

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Laboratoire d’études physico-chimiques, Faculté des sciencesUniversité de Saida-Dr. Moulay TaharSaidaAlgeria

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