Tuning Magnetic and Transport Properties in Quasi-2D (Mn1−xNix)2P2S6 Single Crystals
Tuning Magnetic and Transport Properties in Quasi-2D (Mn1−xNix)2P2S6 Single Crystals
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DOI：
10.3390/electronicmat2030020
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发表时间：
2021-04
影响因子：
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通讯作者：
Y. Shemerliuk;Yonghui Zhou;Zhaorong Yang;G. Cao;A. Wolter;B. Büchner;S. Aswartham
中科院分区：
文献类型：
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作者：
Y. Shemerliuk;Yonghui Zhou;Zhaorong Yang;G. Cao;A. Wolter;B. Büchner;S. Aswartham
我们报告了一种优化的化学气相传输方法来生长（Mn1-xNix）2P2S6单晶，其中x = 0、0.3、0.5、0.7和1。用此方法获得了尺寸为4 mm × 3 mm × 200 μ m的单晶。生长的晶体，其特征在于通过扫描电子显微镜和粉末X射线衍射测量。结构表征表明，所有晶体均为单斜对称晶体，空间群为C2/m（No.12）。我们进一步研究了这一系列单晶的磁性。磁性测量结果表明，所有生长的单晶体沿沿着所有主晶轴均呈现长程反铁磁有序。总的来说，Néel温度TN是非单调的;随着Ni 2+掺杂的增加，反铁磁相变的温度首先从原始Mn2P2S6（x = 0）的80 K降低到x = 0.5，然后再次增加到纯Ni2P2S6（x = 1）的155 K。在（Mn1 − xNix）2P2S6系列中，磁各向异性随组成从面外切换到面内。在静水压力下对母体化合物Mn2P2S6的输运研究表明，在约22 GPa的临界压力下发生了绝缘体-金属转变。
We report an optimized chemical vapor transport method to grow single crystals of (Mn1−xNix)2P2S6 where x = 0, 0.3, 0.5, 0.7, and 1. Single crystals up to 4 mm × 3 mm × 200 μm were obtained by this method. As-grown crystals are characterized by means of scanning electron microscopy and powder X-ray diffraction measurements. The structural characterization shows that all crystals crystallize in monoclinic symmetry with the space group C2/m (No. 12). We have further investigated the magnetic properties of this series of single crystals. The magnetic measurements of the all as-grown single crystals show long-range antiferromagnetic order along all principal crystallographic axes. Overall, the Néel temperature TN is non-monotonous; with increasing Ni2+ doping, the temperature of the antiferromagnetic phase transition first decreases from 80 K for pristine Mn2P2S6 (x = 0) up to x = 0.5 and then increases again to 155 K for pure Ni2P2S6 (x = 1). The magnetic anisotropy switches from out-of-plane to in-plane as a function of composition in (Mn1−xNix)2P2S6 series. Transport studies under hydrostatic pressure on the parent compound Mn2P2S6 evidence an insulator-metal transition at an applied critical pressure of ~22 GPa.