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首页> 外文期刊>Physical review >Fluctuation-induced first-order phase transition in Dzyaloshinskii-Moriya helimagnets
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Fluctuation-induced first-order phase transition in Dzyaloshinskii-Moriya helimagnets

机译：波动引起的Dzyaloshinskii-Moriya helimagnets一阶相变

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摘要

Two centuries of research on phase transitions have repeatedly highlighted the importance of critical fluctuations that abound in the vicinity of a critical point. They are at the origin of scaling laws obeyed by thermodynamic observables close to second-order phase transitions resulting in the concept of universality classes, that is of paramount importance for the study of organizational principles of matter. Strikingly, in case such soft fluctuations are too abundant they may alter the nature of the phase transition profoundly; the system might evade the critical state altogether by undergoing a discontinuous first-order transition into the ordered phase. Fluctuation-induced first-order transitions have been discussed broadly and are germane for superconductors, liquid crystals, or phase transitions in the early universe, but clear experimental confirmations remain scarce. Our results from neutron scattering and thermodynamics on the model Dzyaloshinskii-Moriya (DM) helimagnet (HM) MnSi show that such a fluctuation-induced first-order transition is realized between its paramagnetic and HM state with remarkable agreement between experiment and a theory put forward by Brazovskii. While our study clarifies the nature of the HM phase transition in MnSi that has puzzled scientists for several decades, more importantly, our conclusions entirely based on symmetry arguments are also relevant for other DM-HMs with only weak cubic magnetic anisotropies. This is in particular noteworthy in light of a wide range of recent discoveries that show that DM helimagnetism is at the heart of problems such as topological magnetic order, multiferroics, and spintronics.
机译：关于相变的两个世纪研究反复强调了在临界点附近大量存在的临界波动的重要性。它们是热力学可观察到的接近二阶相变的比例定律的起源，从而导致了通用性类别的概念，这对于研究物质的组织原理至关重要。令人惊讶的是，如果这种软波动过大，则可能会极大地改变相变的性质。系统可能会经历不连续的一阶过渡到有序阶段，从而完全避开临界状态。波动引起的一阶跃迁已经被广泛讨论，并且与早期宇宙中的超导体，液晶或相变密切相关，但是仍然缺乏明确的实验确认。我们在Dzyaloshinskii-Moriya（DM）直升机磁铁（HM）MnSi模型上的中子散射和热力学结果表明，这种波动引起的一阶跃迁是在其顺磁性和HM状态之间实现的，实验与理论之间取得了显着的一致性由Brazovskii。尽管我们的研究澄清了几十年来困扰着科学家的MnSi中HM相变的性质，但更重要的是，我们完全基于对称性参数得出的结论也与仅具有弱立方磁各向异性的其他DM-HM有关。鉴于最近的大量发现表明DM电磁效应是诸如拓扑磁序，多铁性和自旋电子学等问题的核心，这尤其值得注意。

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  • 来源
    《Physical review》 |2013年第13期|134407.1-134407.16|共16页
  • 作者

    M. Janoschek; M. Garst; A. Bauer; P. Krautscheid; R. Georgii; P. Boeni; C. Pfleiderer;

  • 作者单位

    Physik Department E21, Technische Universitaet Muenchen, D-85748 Garching, Germany,Department of Physics, University of California, San Diego, La Jolla, California 92093-0354, USA,Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Institute for Theoretical Physics, Universitaet zu Koeln, D-50937 Koeln, Germany;

    Physik Department E21, Technische Universitaet Muenchen, D-85748 Garching, Germany;

    Institute for Theoretical Physics, Universitaet zu Koeln, D-50937 Koeln, Germany;

    Physik Department E21, Technische Universitaet Muenchen, D-85748 Garching, Germany,Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universitaet Muenchen, D-85748 Garching, Germany;

    Physik Department E21, Technische Universitaet Muenchen, D-85748 Garching, Germany;

    Physik Department E21, Technische Universitaet Muenchen, D-85748 Garching, Germany;

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  • 关键词

    magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); exchange, correlation, dielectric and magnetic responsernfunctions, plasmons;

    机译：磁相边界（包括磁跃迁;超磁性等）;交换;相关;介电和磁响应函数;等离激元;

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