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arXiv 2006.12145cond-mat.mtrl-scicond-mat.str-el
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二维自旋玻璃Mn $_{0.5}$ Fe $_{0.5}$ PS $_3$中的局域核有序和磁有序

Local nuclear and magnetic order in the two-dimensional spin glass, Mn$_{0.5}$Fe$_{0.5}$PS$_3$

J. N. Graham, M. J. Coak, S. Son, E. Suard, J. -G. Park, L. Clark, A. R. Wildes

摘要:

本文对二维自旋玻璃Mn $_{0.5}$ Fe $_{0.5}$ PS $_3$中的短程核有序和磁有序进行了全面的研究。核中子散射数据揭示了蜂窝层内Mn $^{2+}$和Fe $^{2+}$离子的随机分布,这通过诱导相邻交换相互作用之间的竞争而产生自旋玻璃态,在磁化率数据中由玻璃化转变处的尖点$T_g = 35$ K表示。单晶和多晶样品收集的磁漫中子散射数据的分析给出了进一步深入了解的起源的自旋玻璃相,与自旋相关性揭示了满意和不满意的蜂窝状平面内的磁矩之间的相关性的混合物,这可以通过考虑的母体化合物,MnPS $_3$和FePS $_3$的磁结构来解释。我们发现,在接近$T_g$从上面,一个整体平均的相关长度$ξ= 5.5(6)$的发展之间的满意的相关性,和低于$T_g$,玻璃态行为引起了一个距离无关的相关性之间的不满意的时刻。发现平面之间的相关性非常弱,这反映了我们在单晶衍射测量中观察到的平行于c* 轴的棒状结构,证实了Mn $_{0.5}$ Fe $_{0.5}$ PS $_3$的二维性质。

英文摘要:

We present a comprehensive study of the short-ranged nuclear and magnetic order in the two-dimensional spin glass, Mn$_{0.5}$Fe$_{0.5}$PS$_3$. Nuclear neutron scattering data reveal a random distribution of Mn$^{2+}$ and Fe$^{2+}$ ions within the honeycomb layers, which gives rise to a spin glass state through inducing competition between neighbouring exchange interactions, indicated in magnetic susceptibility data by a cusp at the glass transition, $T_g = 35$ K. Analysis of magnetic diffuse neutron scattering data collected for both single crystal and polycrystalline samples gives further insight into the origin of the spin glass phase, with spin correlations revealing a mixture of satisfied and unsatisfied correlations between magnetic moments within the honeycomb planes, which can be explained by considering the magnetic structures of the parent compounds, MnPS$_3$ and FePS$_3$. We found that, on approaching $T_g$ from above, an ensemble-averaged correlation length of $ξ= 5.5(6)$ Å developed between satisfied correlations, and below $T_g$, the glassy behaviour gave rise to a distance-independent correlation between unsatisfied moments. Correlations between the planes were found to be very weak, which mirrored our observations of rod-like structures parallel to the c* axis in our single crystal diffraction measurements, confirming the two-dimensional nature of Mn$_{0.5}$Fe$_{0.5}$PS$_3$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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