Anisotropic magnetoresistance in the itinerant antiferromagnetic EuTiO3

We report on measurements of the anisotropic magnetoresistance (AMR) of doped $\mathrm{EuTi}{\mathrm{O}}_{3}$. It is shown that the primary contribution to the AMR is the crystalline component, which depends on the relative orientation between the magnetic moments and the crystal axes. With increasing magnetic field, a fourfold crystalline AMR undergoes a change in its alignment with respect to the crystal axes. The results are discussed in the context of the coupling between spin canting, electronic structure, and transport. We discuss the potential role of Weyl points in the band structure. At high fields, the AMR transitions to uniaxial symmetry, which is lower than that of the lattice, along with a crossover from positive to negative magnetoresistance.