论文标题
Mn $ _ {5} $ GE $ _ {3} $ Ferromagnet中的关键行为
Critical behavior in the Mn$_{5}$Ge$_{3}$ ferromagnet
论文作者
论文摘要
高温温度的铁磁体是设计新的Spintronic设备的有前途的候选人。在这里，我们已经成功合成了流动的Ferromagnet Mn $ _ {5} $ ge $ _ {3} $使用的通量法及其关键属性的单晶样本，并通过批量DC-Magnetization进行了研究，该属性是通过额定的DC-MAGNETIZER进行的。临界指示剂$β= 0.336 \ pm 0.001 $，具有临界温度$ t_ {c} = 300.29 \ pm 0.01 $ k和$γ= 1.193 \ pm 0.003 \ pm 0.003 $，$ t_ {c} = 300.15 = 300.15 \ pm 0.05 $ k由Modified Arrott IS $ 0. $ 0. $ t_ {c} = 300 $ K的等温分析。这些关键指数的自洽和可靠性通过widom缩放定律和缩放方程式验证。进一步的分析表明，Mn $ _ {5} $ ge $ _ {3} $中的自旋耦合表现为三维ISING样的行为。发现磁交换的衰减为$ j（r）\ of r^{ - 4.855} $，并且自旋相互作用延伸到最近的邻居之外，这可能与不同集的Mn-mn相互作用有关，其交换强度不相等。此外，Mn $ _ {5} $ ge $ _ {3} $中的非共线旋转配置的存在导致与标准3D-sisting模型的关键指数相比，获得的关键指数很小。
High-Curie-temperature ferromagnets are promising candidates for designing new spintronic devices. Here we have successfully synthesized a single-crystal sample of the itinerant ferromagnet Mn$ _{5}$Ge$_{3}$ used flux method and its critical properties were investigated by means of bulk dc-magnetization at the boundary between the ferromagnetic (FM) and paramagnetic (PM) phase. Critical exponents $ β=0.336 \pm 0.001 $ with a critical temperature $ T_{c}=300.29 \pm 0.01 $ K and $ γ=1.193 \pm 0.003 $ with $ T_{c} = 300.15 \pm 0.05 $ K are obtained by the modified Arrott plot, whereas $ δ= 4.61 \pm 0.03 $ is deduced by a critical isotherm analysis at $ T_{c} = 300 $ K. The self-consistency and reliability of these critical exponents are verified by the Widom scaling law and the scaling equations. Further analysis reveals that the spin coupling in Mn$ _{5}$Ge$_{3}$ exhibits three-dimensional Ising-like behavior. The magnetic exchange is found to decay as $ J(r)\approx r^{-4.855} $ and the spin interactions are extended beyond the nearest neighbors, which may be related to different set of Mn--Mn interactions with unequal magnitude of exchange strengths. Additionally, the existence of noncollinear spin configurations in Mn$ _{5} $Ge$ _{3} $ results in a small deviation of obtained critical exponents from those for standard 3D-Ising model.
