Skyrmions and Fluctuations of Spin Spirals in Strongly Correlated Fe1–хCoхSi with Noncentrosymmetric Cubic Structure

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Abstract

Strongly correlated Fe1–хCoxSi solid solutions with broken B20-type cubic structure are studied. Within the framework of the spin-fluctuation theory and in the model of the density of electronic states, arising from first-principles calculations within the framework of the generalized gradient approximation taking into account strong Coulomb correlations (GGA+U) temperature transitions are considered in strongly correlated Fe1–хCoxSi alloys (for example, x = 0.2, 0.3) with the Dzyaloshinskii–Moriya (DM) interaction. It is shown that in the compositions under consideration, a first-order magnetic phase transition, which is prolonged in temperature, occurs, during which the sign of the intermode coupling parameter in the Ginzburg–Landau functional changes. It is found that such a transition results in the formation of skyrmion A-phases in limited ranges of temperatures and external magnetic fields, beyond which the experimentally observed fluctuations of spin spirals are realized. The constructed (h–Т)-diagrams (which indicate the range of long-range order, fluctuation and skyrmion phases) of Fe1–хCoxSi at x = 0.2 and 0.3 are consistent with the experiment.

About the authors

А. А. Povzner

Ural Federal University Named After the First President of Russia B. N. Yeltsin

Author for correspondence.
Email: a.a.povzner@urfu.ru
Russian Federation, Yekaterinburg, 620002

А. G. Volkov

Ural Federal University Named After the First President of Russia B. N. Yeltsin

Email: a.a.povzner@urfu.ru
Russian Federation, Yekaterinburg, 620002

Т. А. Nogovitsyna

Ural Federal University Named After the First President of Russia B. N. Yeltsin

Email: a.a.povzner@urfu.ru
Russian Federation, Yekaterinburg, 620002

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