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DFT study with different exchange-correlation potentials of physical properties of the new synthesized alkali-metal based Heusler alloy

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Abstract

The aim purpose of this work is to investigate the various physical properties of the new synthesized alkali-metal based Heusler alloy Li2CoSb using the density functional theory. The results showed that the compound has ferromagnetic ground state and is mechanically stable against any small deformations. We performed calculations for different exchange-correlation potentials to obtain the magneto-electronic properties. The generalized gradient approximation (GGA) findings showed a metallic electronic nature with a weak magnetic moment. However, calculations by the modified Becke–Johnson exchange potential combined with GGA correlation (mBJ-GGA) indicated an increase in the magnetic moment but the alloy remains with a metallic character. To respect the strong electron correlation effect for the localized d states in the calculations, the mBJ-GGA + U scheme was used. The Half-metallic ferromagnetism behavior with integer total magnetic moment was found. The half-metallic property is preserved at a range 2–5 eV of Hubbard U parameter. The thermoelectric properties were calculated and divulged that the compound studied exhibit a high figure of merit, large Seebeck coefficient, and low thermal conductivity. Hence, the Li2CoSb is a good thermoelectric compound. The thermal and pressure effect on the isochoric and isobaric heat capacity and Debye temperature were studied using the quasiharmonic approximation. It is important to emphasis that all the investigated properties have not been studied yet for the present Li-based Heusler compound. Therefore, the present work can be considered as a first report.

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Authors and Affiliations

  1. Laboratory for Theoretical Physics and Material Physics (LPTPM), Department of physics, Faculty of Exact Sciences and Informatics, Hassiba Benbouali University of Chlef, Chlef, Algeria

    Tariq Hadji, Hafid Khalfoun & Ahmed Azzouz-Rached

  2. Department of Physics, Faculty of Exact Sciences and Informatics, Hassiba Benbouali University of Chlef, Chlef, Algeria

    Hafid Khalfoun & Habib Rached

  3. Magnetic Materials Laboratory (LMM), Faculty of Exact Sciences, Djillali Liabes University of Sidi Bel-Abbes, Sidi Bel-Abbes, Algeria

    Habib Rached, Youcef Guermit & Djamel Rached

Authors
  1. Tariq Hadji
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  2. Hafid Khalfoun
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  3. Habib Rached
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  4. Youcef Guermit
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  5. Ahmed Azzouz-Rached
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  6. Djamel Rached
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Correspondence to Habib Rached.

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Hadji, T., Khalfoun, H., Rached, H. et al. DFT study with different exchange-correlation potentials of physical properties of the new synthesized alkali-metal based Heusler alloy. Eur. Phys. J. B 93, 214 (2020). https://doi.org/10.1140/epjb/e2020-10204-5

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