基于电子顺磁共振和中子散射的MnSi自旋涨落跃迁

IF 0.6 4区 物理与天体物理 Q4 MECHANICS
S. V. Demishev
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引用次数: 0

摘要

低温(T <分析了单硅化锰(MnSi)螺旋磁铁在40k时的中子散射和电子顺磁共振特性。建立了自旋涨落跃迁(SFTs)的存在干扰了传统磁相变理论及其推广到螺旋磁体的自旋涨落参数的平滑演化,其中自旋涨落的幅度及其相关半径发生了急剧变化。在零磁场下,温度为Tc = 29 K的相变通常被解释为向螺旋磁有序相的相变,在此之前有T1 = 32 K和T2 = 30.5 K的两个自旋涨落相变。在温度为29k、温度与Tc一致的B ~ 2t磁场中,发现了另一个自旋涨落跃迁,具有磁有序相内部SFT的参数特征。结果表明,随着温度的降低,MnSi在T = T1处发生SFT,并出现螺旋起伏,而在T = T2处出现螺旋相(B = 0)或自旋极化相(B = 2t),并伴有自旋起伏跃迁。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Spin-Fluctuation Transitions in MnSi According to Electron Paramagnetic Resonance and Neutron Scattering

Spin-Fluctuation Transitions in MnSi According to Electron Paramagnetic Resonance and Neutron Scattering

The experimental data on low-temperature (T < 40 K) neutron scattering and electron paramagnetic resonance for a helical magnet manganese monosilicide (MnSi) are analyzed. It is established that the smooth evolution of the parameters of spin fluctuations considered both in the conventional theory of magnetic phase transitions and in its generalization to the case of helical magnets is disturbed by the presence of spin-fluctuation transitions (SFTs) in which the amplitude of spin fluctuations and their correlation radius change sharply. In a zero magnetic field, the transition at the temperature Tc = 29 K, which is usually interpreted as the transition to a helical magnetically ordered phase, is preceded by two spin-fluctuation transitions with T1 = 32 K and T2 = 30.5 K. In a magnetic field of B ~ 2 T at a temperature of 29 K coinciding with Tc, another spin-fluctuation transition with the parameters characteristic for the SFT inside the magnetically ordered phase is discovered. It is shown that, as the temperature decreases, MnSi at T = T1 undergoes the SFT with the appearance of helical fluctuations, while the appearance of a helical phase (B = 0) or a spin-polarized phase (B = 2 T) occurs at T = T2 and is accompanied by a spin-fluctuation transition.

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来源期刊
Doklady Physics
Doklady Physics 物理-力学
CiteScore
1.40
自引率
12.50%
发文量
12
审稿时长
4-8 weeks
期刊介绍: Doklady Physics is a journal that publishes new research in physics of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia in the form of short articles. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.
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