论文标题
拓扑半学EUCD2AS2中磁性操纵
Manipulating of magnetism in the topological semimetal EuCd2As2
论文作者
论文摘要
预计磁性Weyl半法具有非凡的物理特性，例如手性异常和大型霍尔效应，可能对将来，潜在的，旋转的应用有用。然而，在大多数已知的宿主材料中，多对Weyl点可以明显地表现出内在拓扑作用。我们最近的密度功能理论（DFT）计算研究表明，EUCD $ _ {2} $作为$ _ {2} $可以在反铁磁性（AFM）中托管Dirac Fermions（AFM）订购状态，或在Ferromagnetly（FM）有序状态下的一对Weyl Fermions。不幸的是，以前合成的晶体以$ t _ {\ textrm {n}} $ \，$ \ simeq $ \，9.5 \，k。在这里，我们将EUCD $ _ {2} $的单晶成功合成为$ _ {2} $，该订单是通过（FM）或反磁性（AFM）取决于频带填充的水平，从而允许使用磁性在同一主机中使用磁性属性。我们通过磁化，电运输，热容量和分辨光发射光谱（ARPES）测量来探索它们的物理特性，并得出结论，EUCD $ _ {2} $作为$ _ {2} $是一个极好的，可调的系统，用于探索磁性订购和拓扑的相互作用。
Magnetic Weyl semimetals are expected to have extraordinary physical properties such as a chiral anomaly and large anomalous Hall effects that may be useful for future, potential, spintronics applications. However, in most known host materials, multiple pairs of Weyl points prevent a clear manifestation of the intrinsic topological effects. Our recent density functional theory (DFT) calculations study suggest that EuCd$_{2}$As$_{2}$ can host Dirac fermions in an antiferromagnetically (AFM) ordered state or a single pair of Weyl fermions in a ferromagnetically (FM) ordered state. Unfortunately, previously synthesized crystals ordered antiferromagnetically with $T_{\textrm{N}}$\,$\simeq$\,9.5\,K. Here, we report the successful synthesis of single crystals of EuCd$_{2}$As$_{2}$ that order ferromagnetically (FM) or antiferromagnetically (AFM) depending on the level of band filling, thus allowing for the use of magnetism to tune the topological properties within the same host. We explored their physical properties via magnetization, electrical transport, heat capacity, and angle resolved photoemission spectroscopy (ARPES) measurements and conclude that EuCd$_{2}$As$_{2}$ is an excellent, tunable, system for exploring the interplay of magnetic ordering and topology.
