Exploring the behavior of EuCuP and EuCuAs*

Materials where magnetism, the lattice and electronic topology are coupled provide opportunities to advance both fundamental science and future technologies. Topological semimetals possessing intrinsic magnetic order afford a particularly promising avenue of study. Under this motivation, we will examine the physical properties of EuCuP and EuCuAs, the former being a complex ferromagnet while the latter is an antiferromagnet. In some regards the nature of the ordered magnetism drives different responses, such as a strong metamagnetic transition in EuCuAs that is lacking in EuCuP. However, the two materials also possess many similarities, including particularly interesting electronic transport properties. The existing literature and our new findings will be discussed and compared to behaviors in other candidate topological semimetals.