论文标题
磁性二聚体和天际晶格形成的证据
Evidences for magnetic dimers and skyrmion lattice formation in Eu$_2$Pd$_2$Sn
论文作者
论文摘要
在包括新的测量值之后，重新探访了非中心的核对称化合物欧盟$ _2 $ _2 $ _2 $ sn的磁，热和传输特性。在其顺磁性阶段，该化合物的出色特征是Eu $^{2+} $二聚体的形成，可以理解磁化易感性$χ（t）$从下面的C-W Law中的偏差，大约70 \，K，k，the the field agnetization $ m（b）$ m（b）$ variative $ m（b）$ wariative $ \ y \ y \ 80 $ \ \ y \ \ y \ y \ y \ y \ y cy $ \ ofdy $ \ offersopy coppoys coppoys，k y \ 80 $。 0.64r \ ln（8）$。交易所交互的重大更改发生在$ t \约70 $ \，k（其中$θ_p= 18 $ \，k）和$ t_n = 13.3 $ \，k（其中$θ_p= -4.5 $ \，k）。与纯EU $^{2+} $相比，强大的电子重叠是由欧盟欧盟的间距减少而产生的，这些重叠有望为这些准颗粒形成供电，从而诱导了对磁性结构的显着重新印象。 从磁参数的衍生物的分析中获得了丰富的磁相图：$ \ partialχ/\ partial t $和$ \ partial m/\ partial b $，以及特定热量的场依赖性。认识到两个关键点，并提出了磁性结构的初步描述。关于相图中磁性沮丧的口袋的存在，Skyrmion晶格的可能形成是由关于六边形结构表现出相似相互作用模式的理论研究。
Magnetic, thermal and transport properties of the non-centrosymmetric compound Eu$_2$Pd$_2$Sn are revisited after including new measurements. In its paramagnetic phase, the outstanding feature of this compound is the formation of Eu$^{2+}$ dimers that allows to understand the deviation of the magnetic susceptibility $χ(T)$ from the C-W law below about 70\,K, the field dependent magnetization $M(B)$ variation below $\approx 80$\,K and the reduced entropy at the ordering temperature $S(T_N)= 0.64R\ln(8)$. A significant change of the exchange interactions occurs between $T\approx 70$\,K (where $θ_P = 18$\,K) and $T_N = 13.3$\,K (where $θ_P =-4.5$\,K). The strong electronic overlap, arising from the reduced Eu-Eu spacing compared with that of pure Eu$^{2+}$ is expected to power these quasiparticles formation, inducing a significant reformulation of the magnetic structure. A rich magnetic phase diagram is obtained from the analysis of the derivatives of the magnetic parameters: $\partial χ/\partial T$ and $\partial M/\partial B$, and the field dependence of the specific heat. Two critical points are recognized and a tentative description of the magnetic structures is proposed. The possible formation of a skyrmion lattice, that arises from the presence of magnetically frustrated pockets in the phase diagram, is suggested by theoretical studies on hexagonal structures exhibiting similar interactions pattern.
