论文标题
分层EUZN2AS2中的异常电气和磁性
Unusual electrical and magnetic properties in layered EuZn2As2
论文作者
论文摘要
基于欧盟的化合物通常表现出异常的磁性，这对于在EUCD2AS2等材料中看到的非平凡拓扑特性至关重要。我们通过测量电阻率，霍尔效应，磁化和中子衍射来研究EUZN2AS2的结构和物理特性。我们的数据表明，EUZN2AS2在TN = 19 K下方以A型自旋构型在抗磁磁体上，令人惊讶的是，有强有力的证据表明，TN上方的优势铁磁波动占主导地位，由正质库里斯 - 温度和极大的负磁性（MR）依赖（MR）指示为200k。从AB平面到距AB平面约45°的方向的重新定位。与EUCD2AS2相比，TN和TFL的加倍使EUZN2AS2成为探索磁波动（TN <T <TFL）和有序（T <TN）方案的拓扑特性的更好平台。
Eu-based compounds often exhibit unusual magnetism, which is critical for nontrivial topological properties seen in materials such as EuCd2As2. We investigate the structure and physical properties of EuZn2As2 through measurements of the electrical resistivity, Hall effect, magnetization, and neutron diffraction. Our data show that EuZn2As2 orders antiferromagnetically with an A-type spin configuration below TN = 19 K. Surprisingly, there is strong evidence for dominant ferromagnetic fluctuations above TN, as reflected by positive Curie-Weiss temperature and extremely large negative magnetoresistance (MR) between TN and Tfl » 200 K. Furthermore, the angle dependence of the MRab indicates field-induced spin reorientation from the ab-plane to a direction approximately 45° from the ab plane. Compared to EuCd2As2, the doubled TN and Tfl make EuZn2As2 a better platform for exploring topological properties in both magnetic fluctuation (TN < T < Tfl) and ordered (T < TN) regimes.
