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首页> 外文期刊>Physical review >Magnetic order of intermetallic FeGa_(3-y)Ge_y studied by µSR and~(57)Fe Mössbauer spectroscopy
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Magnetic order of intermetallic FeGa_(3-y)Ge_y studied by µSR and~(57)Fe Mössbauer spectroscopy

机译：用μSR和〜（57）FeMössbauer光谱研究金属间化合物FeGa_（3-y）Ge_y的磁阶

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摘要

Temperature-dependent magnetization, muon spin rotation, and ~(57)Fe Mössbauer spectroscopy experiments performed on crystals of intermetallic FeGa_(3-y)Ge_y (y = 0.11,0.14,0.17,0.22,0.27,0.29,0.32) are reported. Whereas at y = 0.11 even a sensitive magnetic microprobe such as µSR does not detect magnetism, all other samples display weak ferromagnetism with a magnetic moment of up to 0.22µ_B per Fe atom. As a function of doping and of temperature, a crossover from short-range to long-range magnetic order is observed, characterized by a broadly distributed spontaneous internal field. However, = 0.14 and 0.17 remain in the short-range-ordered state down to the lowest investigated temperature. The transition from short-range to long-range order appears to be accompanied by a change of the character of the spin fluctuations, which exhibit a spin-wave excitation signature in the long-range-order part of the phase diagram. Mössbauer spectroscopy for y = 0.27 and 0.32 indicates that the internal field lies in the plane perpendicular to the crystallographic c axis. The field distribution and its evolution with doping suggest that the details of the Fe magnetic moment formation and the consequent magnetic state are determined not only by the dopant concentration, but also by the way the replacement of the Ga atoms surrounding the Fe is accomplished.
机译：报道了对金属间FeGa_（3-y）Ge_y（y = 0.11,0.14,0.17,0.22,0.27,0.29,0.32）晶体进行的随温度变化的磁化强度，μ自旋旋转和〜（57）FeMössbauer光谱实验。在y = 0.11时，即使是灵敏的磁性微探针（如µSR）也无法检测到磁性，而所有其他样品均显示弱铁磁性，每个Fe原子的磁矩高达0.22µB。作为掺杂和温度的函数，观察到从短距离到长距离磁阶的交叉，其特征在于广泛分布的自发内部磁场。但是，= 0.14和0.17保持在短程有序状态，直到最低研究温度。从短程到长程的过渡似乎伴随着自旋涨落特性的变化，自旋涨落的变化在相图的长程部分显示出自旋波激发特征。 y = 0.27和0.32的Mössbauer光谱表明内部场位于垂直于晶体学c轴的平面上。场分布及其随掺杂的演变表明，Fe磁矩的形成和随之产生的磁态的细节不仅取决于掺杂剂的浓度，还取决于完成Fe周围Ga原子置换的方式。

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  • 来源
    《Physical review》 |2017年第12期|125138.1-125138.8|共8页
  • 作者

    J. Munevar; M. Cabrera-Baez; M. Alzamora; J. Larrea; E. M. Bittar; E. Baggio-Saitovitch; F. J. Litterst; R. A. Ribeiro; M. A. Avila; E. Morenzoni;

  • 作者单位

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland;

    CCNH, Universidade Federal do ABC (UFABC), Santo Andre, SP 09210-580, Brazil;

    Universidade Federal do Rio de Janeiro, Campus Xerém, RJ 25245-390, Brazil;

    Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ 22290-180, Brazil;

    Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ 22290-180, Brazil;

    Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ 22290-180, Brazil;

    Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ 22290-180, Brazil ,Technische Universität Braunschweig, 38106 Braunschweig, Germany;

    CCNH, Universidade Federal do ABC (UFABC), Santo Andre, SP 09210-580, Brazil;

    CCNH, Universidade Federal do ABC (UFABC), Santo Andre, SP 09210-580, Brazil;

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland;

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