The behavior of 2-dimensional (2D) van der Waals (vdW) layered magnetic materials in the 2D limit of the few-layer thickness is an important fundamental issue for the understanding of the magnetic ordering in lower dimensions. The antiferromagnetic transition temperature TN of the Heisenberg-type 2D magnetic vdW material MnPS3 was estimated as a function of the number of layers. The antiferromagnetic transition was identified by temperature-dependent Raman spectroscopy, from the broadening of a phonon peak at 155 cm-1, accompanied by an abrupt redshift and an increase of its spectral weight. TN is found to decrease only slightly from ~78 K for bulk to ~ 66 K for 3L. The small reduction of TN in thin MnPS3 approaching the 2D limit implies that the interlayer vdW interaction is playing an important role in stabilizing magnetic ordering in layered magnetic materials.

中文翻译：

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海森堡型 MnPS3 中反铁磁相变的厚度依赖性

二维 (2D) 范德华 (vdW) 层状磁性材料在少层厚度的二维限制中的行为是理解低维磁性排序的重要基本问题。海森堡型 2D 磁性 vdW 材料 MnPS3 的反铁磁转变温度 TN 被估计为层数的函数。反铁磁转变是通过温度相关拉曼光谱确定的，从 155 cm-1 处声子峰的展宽，伴随着突然的红移和其光谱权重的增加。发现 TN 从散装的~78 K 仅略微降低到 3L 的~66 K。