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
{"title":"基于电子顺磁共振和中子散射的MnSi自旋涨落跃迁","authors":"S. V. Demishev","doi":"10.1134/S1028335822100032","DOIUrl":null,"url":null,"abstract":"<p>The experimental data on low-temperature (<i>T</i> &lt; 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 <i>T</i><sub>c</sub> = 29 K, which is usually interpreted as the transition to a helical magnetically ordered phase, is preceded by two spin-fluctuation transitions with <i>T</i><sub>1</sub> = 32 K and <i>T</i><sub>2</sub> = 30.5 K. In a magnetic field of <i>B</i> ~ 2 T at a temperature of 29 K coinciding with <i>T</i><sub>c</sub>, 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 <i>T</i> = <i>T</i><sub>1</sub> undergoes the SFT with the appearance of helical fluctuations, while the appearance of a helical phase (<i>B</i> = 0) or a spin-polarized phase (<i>B</i> = 2 T) occurs at <i>T</i> = <i>T</i><sub>2</sub> and is accompanied by a spin-fluctuation transition.</p>","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2023-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Spin-Fluctuation Transitions in MnSi According to Electron Paramagnetic Resonance and Neutron Scattering\",\"authors\":\"S. V. Demishev\",\"doi\":\"10.1134/S1028335822100032\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The experimental data on low-temperature (<i>T</i> &lt; 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 <i>T</i><sub>c</sub> = 29 K, which is usually interpreted as the transition to a helical magnetically ordered phase, is preceded by two spin-fluctuation transitions with <i>T</i><sub>1</sub> = 32 K and <i>T</i><sub>2</sub> = 30.5 K. In a magnetic field of <i>B</i> ~ 2 T at a temperature of 29 K coinciding with <i>T</i><sub>c</sub>, 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 <i>T</i> = <i>T</i><sub>1</sub> undergoes the SFT with the appearance of helical fluctuations, while the appearance of a helical phase (<i>B</i> = 0) or a spin-polarized phase (<i>B</i> = 2 T) occurs at <i>T</i> = <i>T</i><sub>2</sub> and is accompanied by a spin-fluctuation transition.</p>\",\"PeriodicalId\":533,\"journal\":{\"name\":\"Doklady Physics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.6000,\"publicationDate\":\"2023-03-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Doklady Physics\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S1028335822100032\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MECHANICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Doklady Physics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S1028335822100032","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MECHANICS","Score":null,"Total":0}
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.

求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
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.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信