Paramagnetic to antiferromagnetic transition in epitaxial tetragonal CuMnAs (invited)

In this paper, we use neutron scattering and electrical transport to investigate the paramagnetic to antiferromagnetic phase transition in tetragonal CuMnAs films on GaP(001). X-ray diffraction and cross-sectional transmission electron microscopy measurements show that the films are chemically ordered with high structural quality. The temperature dependence of the structurally forbidden (100) neutron scattering peak is used to determine the Neel temperature, TN. We then demonstrate the presence of a clear peak in the temperature derivative of the resistivity around TN. The effect of disorder-induced broadening on the shape of the peak is discussed.