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<b>Abstract</b>— <p>The chiral magnetism arising from doping with cobalt atoms of the diamagnetic Weyl semimetal CoSi with a B20 structure (without an inversion center) was investigated. First-principles modeling of the electronic structure of Co(Si<sub>1&#xa0;–&#xa0;<i>x</i></sub>Co<sub><i>x</i></sub>) shows that doping significantly increases the density of electronic states of the paramagnetic phase. An energy shift of the topological features of the electronic structure of CoSi occurs resulting in anomalously small positive values of the parameters of interaction between modes. It was found that as the temperature decreases, the chemical potential turns out to be in the energy region of electronic states with Berry degeneracy, and the sign of the mode-mode interaction parameter becomes negative. This leads to a transition to the region of short-range spin order with chiral fragments of spin spirals, and spin skyrmions are formed in an external magnetic field. After temperature is shifted to the chemical potential beyond the Berry curvature, chiral ferromagnetism appears.</p>

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Phase Transitions and High-Temperature Spin Skyrmions in Doped Weyl Semimetals of Co(Si1 – xCox) with Chiral Ferromagnetism

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • A. A. Povzner,
  • A. G. Volkov,
  • A. R. Kuznetsov,
  • Yu. N. Gornostyrev,
  • E. I. Lopatko

摘要

Abstract—

The chiral magnetism arising from doping with cobalt atoms of the diamagnetic Weyl semimetal CoSi with a B20 structure (without an inversion center) was investigated. First-principles modeling of the electronic structure of Co(Si1 – xCox) shows that doping significantly increases the density of electronic states of the paramagnetic phase. An energy shift of the topological features of the electronic structure of CoSi occurs resulting in anomalously small positive values of the parameters of interaction between modes. It was found that as the temperature decreases, the chemical potential turns out to be in the energy region of electronic states with Berry degeneracy, and the sign of the mode-mode interaction parameter becomes negative. This leads to a transition to the region of short-range spin order with chiral fragments of spin spirals, and spin skyrmions are formed in an external magnetic field. After temperature is shifted to the chemical potential beyond the Berry curvature, chiral ferromagnetism appears.