Skyrmions and Fluctuations of Spin Spirals in Strongly Correlated Fe1–хCoхSi with Noncentrosymmetric Cubic Structure
- Авторлар: Povzner А.А.1, Volkov А.G.1, Nogovitsyna Т.А.1
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Мекемелер:
- Ural Federal University Named After the First President of Russia B. N. Yeltsin
- Шығарылым: № 8 (2024)
- Беттер: 78-84
- Бөлім: Articles
- URL: https://journal-vniispk.ru/1028-0960/article/view/274328
- DOI: https://doi.org/10.31857/S1028096024080102
- EDN: https://elibrary.ru/ELDEWZ
- ID: 274328
Дәйексөз келтіру
Аннотация
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.
Толық мәтін

Авторлар туралы
А. Povzner
Ural Federal University Named After the First President of Russia B. N. Yeltsin
Хат алмасуға жауапты Автор.
Email: a.a.povzner@urfu.ru
Ресей, Yekaterinburg, 620002
А. Volkov
Ural Federal University Named After the First President of Russia B. N. Yeltsin
Email: a.a.povzner@urfu.ru
Ресей, Yekaterinburg, 620002
Т. Nogovitsyna
Ural Federal University Named After the First President of Russia B. N. Yeltsin
Email: a.a.povzner@urfu.ru
Ресей, Yekaterinburg, 620002
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