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Fluctuation-Induced Phase Transitions and Skyrmions in Strongly Correlated Fe 1 – x Co x Si with a Disturbed Crystal B20-Type Structure
Physics of the Solid State ( IF 0.9 ) Pub Date : 2021-04-05 , DOI: 10.1134/s1063783421030148
A. A. Povzner , A. G. Volkov , T. A. Nogovitsyna , S. A. Bessonov

Abstract

The concentration and temperature transitions in strongly correlated Fe1 – xCoxSi alloys with the Dzyaloshinski–Moriya (DM) interaction are considered in terms of the spin-fluctuation theory taking into account the results of LDA + U + SO calculations of the density of electronic states. It is shown that the concentration order–order transitions with change in the sign of the left spin chirality (at x < 0.2) to the right that (at x ≤ 0.2x < 0.65, and again to the left chirality at x ≥ 0.65 are related to the change in the sign of the parameter of the mode–mode interaction. It is also shown that, in the composition range of Fe1 – xCoxSi with 0.2 ≤ x < 0.65, the first-order transitions extended in temperature arise, accompanied by the appearance of an intermediate temperature range of the spin short-range order with a noncompensated local magnetization and the DM interaction. In an external magnetic field, in this temperature range at 0.2 ≤ x < 0.65, skyrmion microstructures arise. At x = 0.65, the mode–mode interaction parameter becomes be zero, the long-range order becomes ferromagnetic (since the experiment demonstrates the compensation of the DM interaction), and a temperature second-order transition appears instead of the extended first-order transition. The (hT) diagrams of magnetic states of Fe1 – xCoxSi have been constructed; they agree with the experiment.



中文翻译:

具有扰动的晶体B20型结构的强相关Fe 1 – x Co x Si中的涨落诱导相变和Skyrmion

摘要

考虑自旋涨落理论,考虑到LDA + U + SO对密度的计算结果,考虑了具有Dzyaloshinski-Moriya(DM)相互作用的高度相关的Fe 1 –  x Co x Si合金的浓度和温度转变。电子状态。结果表明,与在左旋手性的符号改变的浓度阶阶转变(在X <0.2),其(在合适的X ≤0.2 X <0.65,并再次向左侧在手性X ≥0.65是与模式-模式相互作用参数符号的变化有关,也表明,在Fe 1-  x Co的组成范围内X的Si 0.2≤  X <0.65时,第一级转变延伸温度出现,伴随着中间温度范围内的自旋短程有序的外观与无补偿局部磁化和DM相互作用。在外部磁场中,在此温度范围内,以0.2≤ X <0.65,skyrmion微结构产生。在x = 0.65时,模-模相互作用参数变为零,长程阶变为铁磁(因为实验证明了DM相互作用的补偿),并且出现了温度二阶跃迁而不是扩展的一阶跃迁。过渡。Fe 1-的磁态( h - T)图 x Co x Si已构建;他们同意实验。

更新日期:2021-04-05
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