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Phase Transitions in Helicoidal Ferromagnets with Concentrational Fluctuations of Local Magnetization

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Abstract

A phenomenological approach to the theory of phase transitions induced by fluctuations in helicoidal ferromagnets with concentrational fluctuations is developed. For this purpose, random variables equal to one at a site ν occupied by a magnetic atom and zero otherwise are introduced into the Ginzburg–Landau functional. It is shown that, above the magnetic transition temperature (TC), due to concentrational effects, local magnetization is preserved, fluctuations of the helicoidal spin helix arise, and skyrmion states in the magnetic field are formed. The disappearance of the vortical states is due to the suppression of local magnetization by thermodynamic fluctuations at the temperature TS (>TC). The theoretical results explain the reasons for the significant expansion of the temperature range of skyrmion states in nonstoichiometric manganese monosilicide with manganese deficiency.

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Funding

This work was supported by the Ministry of Education and Science of the Russian Federation, contract no. 3.9521.2017/8.9.

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Authors and Affiliations

  1. Ural Federal University Named after the First President of Russia B.N. Yeltsin, 620002, Yekaterinburg, Russia

    A. A. Povzner & A. G. Volkov

Authors
  1. A. A. Povzner
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  2. A. G. Volkov
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Correspondence to A. A. Povzner or A. G. Volkov.

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The authors declare that they have no conflict of interest.

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Translated by E. Chernokozhin

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Povzner, A.A., Volkov, A.G. Phase Transitions in Helicoidal Ferromagnets with Concentrational Fluctuations of Local Magnetization. Phys. Solid State 61, 1199–1202 (2019). https://doi.org/10.1134/S1063783419070230

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  • DOI: https://doi.org/10.1134/S1063783419070230

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