弱铁磁体Fe2-xMnxCrAl（0<x<1）的非常规临界行为
Unconventional critical behaviour in weak ferromagnets Fe2-xMnxCrAl (0<x<1)
摘要：
最近对弱铁磁体Fe 2-xMnxCrAl（0<x<1）的研究表明，在铁磁转变温度（TC）以下和以上存在团簇玻璃（CG）和格里菲斯相（GP）[（2019）Sci. Rep. 9 15888]。在这项工作中，这些不均匀相的影响上的临界行为（TC附近）的上述系列合金已被详细研究。对于母合金Fe_2CrAl，γ值为~ 1.34，接近于三维有序Heisenberg模型，而β值为~ 0.273，不属于任何普适类。随着Mn含量的增加，指数γ和\b{eta}均增大，其中γ和β分别接近无序3DHeisenberg模型和有序3DHeisenberg模型。观测到的γ值偏差和δ值的非常规值可归因于GP随Mn浓度的增加。对于β观察到的趋势可以归因于随着Mn含量的增加，CG状态的增加。用Widom标度关系和标度状态方程验证了估计指数的自洽性和可靠性。我们的研究表明，Fe_（2-x）Mn_xCrAl（0<x<1）合金的临界现象可能属于一个单独的类别，没有在任何现有的通用模型框架内描述。
英文摘要：
Recent studies on weak ferromagnets Fe2-xMnxCrAl (0<x<1) reveal the presence of cluster glass (CG) and Griffiths phase (GP) below and above the ferromagnetic transition temperature (TC) [(2019) Sci. Rep. 9 15888]. In this work, the influence of these inhomogeneous phases on the critical behaviour (around TC) of the above-mentioned series of alloys has been investigated in detail. For the parent alloy Fe2CrAl, γ is estimated as ~ 1.34, which lies near to ordered 3D Heisenberg model, whereas obtained value of β ~ 0.273 does not belong to any universality class. With increment in Mn concentration, both exponents γ and \b{eta} increases, where γ and β approaches disordered 3D Heisenberg model and ordered 3D Heisenberg model, respectively. The observed deviation in γ and unconventional value of δ can be ascribed to the increment in GP with Mn-concentration. The trend noted for β can be attributed to the increment in CG regime with an increase in Mn-content. The self-consistency and reliability of the estimated exponents are verified by the Widom scaling relation and scaling equations of state. Our studies indicate that the critical phenomenon of Fe2-xMnxCrAl (0<x<1) alloys possibly belong to a separate class and is not described within the framework of any existing universal model.
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