论文标题
Mn $ _ {1+X} $ fe $ _ {4-x} $ si $ _ {3} $的磁性转变跨磁过渡的关键行为和磁环效应
Critical behavior and magnetocaloric effect across the magnetic transition in Mn$_{1+x}$Fe$_{4-x}$Si$_{3}$
论文作者
论文摘要
详细研究了磁性转换的性质，磁化强度的关键缩放和Mn $ _ {1+x} $ fe $ _ {4-x} $ si $ _ {3} $（$ x = $ 0至1）中的磁性效应。我们的测量结果显示，在整个磁性转变中没有热滞后，这与先前的报告形成鲜明对比，并证实了过渡的二阶性质。可以在Fe位点用MN取代连续调整磁过渡。 MN的替代导致单位细胞体积线性增加，并在生效时刻略有减少。 $ x = 0.0 $的磁化数据和0.2的详细批判分析使用修改后的Arott图，Kouvel-Fisher图，通用曲线缩放以及磁环效应的缩放分析。磁化等温度遵循经过关键指数（$β\ simeq 0.308 $，$γ\ simeq 1.448 $和$δ\ simeq 5.64 $）的修改后的曲线图（$ x = 0.0 $）和（$β\β\ simeq 0.304 $，$γ\ sime $ quime for $ x \ sime quime quime quime quime quime quime quime quime quime quime，simeq 5.64 $）。 $ x = 0.2 $。磁化等温度的Kouvel-Fisher和通用缩放图进一步证实了我们的批判分析和指数值的可靠性。对于不属于任何标准通用类别的父母和掺杂样本，这些关键指数的这些值都相同。合理的磁化效果$ΔS_ {\ rm m} \ simeq-6.67 $ 〜j/kg-k和-5.84〜J/kg-k in $ x = 0.0 $ = 0.0 $和0.2化合物，具有巨大的相对冷却能力（$ rcp \ sim 700 $ 〜j/kg），fives field Change fives ins oss of x = 0.0 $和0.2。磁化效应的通用缩放量进一步模拟了磁过渡的二阶特征。从磁联性效应的临界分析中获得的关键指数与磁等温线分析得出的值一致。
The nature of the magnetic transition, critical scaling of magnetization, and magnetocaloric effect in Mn$_{1+x}$Fe$_{4-x}$Si$_{3}$ ($ x =$ 0 to 1) are studied in detail. Our measurements show no thermal hysteresis across the magnetic transition for the parent compound which is in contrast with the previous report and corroborate the second order nature of the transition. The magnetic transition could be tuned continuously with Mn substitution at the Fe site. The Mn substitution leads to a linear increase in the unit cell volume and a slight reduction in the effective moment. A detailed critical analysis of the magnetization data for $x = 0.0$ and 0.2 is performed in the critical regime using the modified Arrott plots, Kouvel-Fisher plot, universal curve scaling, and scaling analysis of magnetocaloric effect. The magnetization isotherms follow modified Arrott plots with critical exponent ($β\simeq 0.308$, $γ\simeq 1.448$, and $δ\simeq 5.64$) for the parent compound ($x=0.0$) and ($β\simeq 0.304$, $γ\simeq 1.445$, and $δ\simeq 5.64$) for $x = 0.2$. The Kouvel-Fisher and universal scaling plots of the magnetization isotherms further confirm the reliability of our critical analysis and values of the exponents. These values of the critical exponents are found to be same for both the parent and doped samples which do not fall under any of the standard universality classes. A reasonable magnetocaloric effect $ΔS_{\rm m}\simeq-6.67$~J/Kg-K and -5.84~J/Kg-K for $x= 0.0$ and 0.2 compounds, respectively, with a huge relative cooling power ($RCP \sim 700$~J/Kg) for 9~T field change is observed. The universal scaling of magnetocaloric effect further mimics the second order character of the magnetic transition. The obtained critical exponents from the critical analysis of magnetocaloric effect agree with the values deduced from the magnetic isotherm analysis.
