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Magnetic ground state and spin fluctuations in MnGe chiral magnet as studied by muon spin rotation

机译：介子自旋旋转研究MnGe手性磁体的磁性基态和自旋涨落

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摘要

We have studied by muon spin resonance (μSR) the helical ground state and fluctuating chiral phase recently observed in the MnGe chiral magnet. At low temperature, the muon polarization shows double-period oscillations at short-time scales. Their analysis, akin to that recently developed for MnSi [A. Amato et al, Phys. Rev. B 89, 184425 (2014)], provides an estimation of the field distribution induced by the Mn helical order at the muon site. The refined muon position agrees nicely with ab initio calculations. With increasing temperature, an inhomogeneous fluctuating chiral phase sets in, characterized by two well-separated frequency ranges which coexist in the sample. Rapid and slow fluctuations, respectively, associated with short-range and long-range ordered helices, coexist in a large temperature range below T_N = 170 K. We discuss the results with respect to MnSi, taking the short helical period, metastable quenched state, and peculiar band structure of MnGe into account.
机译：我们已经通过μon自旋共振（μSR）研究了MnGe手性磁体中最近观察到的螺旋基态和波动的手性相。在低温下，μ子极化在短时间内显示出双周期振荡。他们的分析类似于最近针对MnSi的分析[A. Amato等人，《物理学报》。 Rev. B 89，184425（2014）]，提供了对介子点处Mn螺旋序诱导的场分布的估计。精确的μon位置与从头算式非常吻合。随着温度升高，出现了不均匀的波动手性相，其特征是样品中共存的两个频率间隔很好。在T_N = 170 K以下的较大温度范围内，分别存在与短程和远程有序螺旋相关的快速波动和缓慢波动。我们以短螺旋周期，亚稳态淬灭态讨论关于MnSi的结果，以及MnGe的特殊能带结构。

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  • 来源
    《Physical review》 |2016年第17期|174405.1-174405.12|共12页
  • 作者

    N. Martin; M. Deutsch; F. Bert; D. Andreica; A. Amato; P. Bonfa; R. De Renzi; U. K. Roessler; P. Bonville; L. N. Fomicheva; A. V. Tsvyashchenko; I. Mirebeau;

  • 作者单位

    Laboratoire Leon Brillouin, CEA, CNRS, Universite Paris-Saclay, CEA Saclay 91191 Gif-sur-Yvette, France;

    Universite de Lorraine, Laboratoire CRM2,UMR UL-CNRS 7036, 54506 Vandoeuvre-les-Nancy, France;

    Laboratoire de Physique du Solide, UMR CNRS 8502, Universite Paris Sud, FR-91140 Orsay, France;

    Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania;

    Laboratory for Muon Spin Spectroscopy, PSI, CH-5232 Vdligen PSI, Switzerland;

    Dipartimento di Fisica e Scienze della Terra and Unita CNISM di Parma, Universita di Parma, 43124 Parma, Italy;

    Dipartimento di Fisica e Scienze della Terra and Unita CNISM di Parma, Universita di Parma, 43124 Parma, Italy;

    Leibnitz Institute for Solid State and Material Research, IFW Dresden D-01069, Germany;

    SPEC, CEA, CNRS, Universite Paris-Saclay, CEA-Saclay, 91191 Gif-sur-Yvette, France;

    Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Moscow, Russia;

    Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Moscow, Russia,Skobeltsyn Institute of Nuclear Physics, MSU, Vorob'evy Gory 1/2, 119991 Moscow, Russia;

    Laboratoire Leon Brillouin, CEA, CNRS, Universite Paris-Saclay, CEA Saclay 91191 Gif-sur-Yvette, France;

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