层状BaMn2Sb2和Ba2Mn3Sb2O2的结构-性能关系
Structure-Property Relationship in Layered BaMn2Sb2 and Ba2Mn3Sb2O2
摘要：
层状过渡金属化合物由于其新颖的物理性质而受到人们的广泛关注。在这里，我们提出的结构，电子，热，磁性能的BaMn 2Sb 2和Ba 2 Mn 3Sb 2 O2单晶，都具有类似于高温超导体的层状结构。MnSb 4四面体环境中的Mn磁矩在BaMn 2Sb 2（TN 1 ~443 K）和Ba 2 Mn 3Sb 2 O2（TN 1 ~314 K）中均形成G型反铁磁（AFM）有序，而在Ba 2 Mn 3Sb 2 O2中，在较低温度（TN 2 ~60 K）的MnO 2层中发现短程AFM有序.在Ba_2Mn_3Sb_2O_2的这两个磁子晶格中的有序矩的方向是相互垂直的，即使该系统是导电的。这表明，在这些化合物中的大磁矩是高度本地化的，导致可以忽略不计的耦合之间的MnSb 4和MnO 2层的Ba 2 Mn 3Sb 2 O2。这些发现为基于结构-磁性的新型超导体设计原理提供了一种新的见解。
英文摘要：
Layered transition-metal compounds have received great attention owing to their novel physical properties. Here, we present the structural, electronic, thermal, and magnetic properties of BaMn2Sb2 and Ba2Mn3Sb2O2 single crystals, both with the layered structure analogous to high-temperature superconductors. While the Mn moment in the MnSb4 tetrahedral environment forms G-type antiferromagnetic (AFM) ordering in both BaMn2Sb2 (TN1~443 K) and Ba2Mn3Sb2O2 (TN1~314 K), a short-range AFM order is found in the intercalated MnO2 layer at a much lower temperature (TN2~60 K) in Ba2Mn3Sb2O2. The directions of the ordered moments in these two magnetic sub-lattices of Ba2Mn3Sb2O2 are perpendicular to each other, even though the system is electrically conductive. This indicates that the large magnetic moments in these compounds are highly localized, leading to negligible coupling between MnSb4 and MnO2 layers in Ba2Mn3Sb2O2. These findings provide an insight into the structure-magnetism-based design principle for new superconductors.
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