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Anomalous metallic and half-metallic properties of the Gd4Sb3 intermetallic compound
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1  M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, Ekaterinburg, Russia
2  Ural Federal University named after the first President of Russia B. N. Yeltsin, Ekaterinburg, Russia
Academic Editor: J.J. Suñol

Abstract:

The electronic structure of the Sb-based intermetallic compound Gd4Sb3 has been studied, and it was recently revealed to have half-metallic properties [1]. Experimentally, anomalous Nernst and Hall effects were also found in Gd4Sb3, which confirmed the half-metallic behavior and anomalous electronic structure of this intermetallic compound [2]. Our calculations were performed according to an ab initio GGA+U method, which accounted for the strong electron correlations in the 4f shell of Gd. The ferromagnetic ordering in Gd4Sb3 is characterized by the large magnetic moment equal to 31 μB / f. u., which is mostly formed by the magnetic moments of the Gd ions. The band structure of Gd4Sb3 has interesting features which were revealed by our spin-polarized calculations. We found that one spin projection had completely metallic properties with multiple bands crossing the Fermi energy, whereas the other one was found to have an energy gap of 0.67 eV. Such features are absent in the binary semimetallic GdSb or metallic GdSb2 compound with the close composition, which makes Gd4Sb3 a new, interesting half-metal ferromagnet with full spin polarization [1]. This research was supported by the Russian Science Foundation pr. No. 22-42-02021.

[1] Baidak, S. T.; Lukoyanov, A. V. Semimetallic, half-metallic, semiconducting, and metallic states in Gd-Sb compounds. Int. J. Mol. Sci. 2023, 24(10), 8778.

[2] Han, Y.; Qiu, C.; Ren, W.; et al. Anomalous Hall and Nernst effects in the half-metallic ferromagnet Gd4Sb3. Phys. Rev. B 2024, 110, 144405.

Keywords: intermetallic compounds; alloys; first principles calculations; electronic structure; half-metals; ferromagnet
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