Correlating magnetic structure and magnetotransport in semimetal thin films of Eu 1 − x Sm x TiO 3

In magnetic Weyl semimetals, anomalous magnetotransport phenomena arise as the result of broken time reversal symmetry and a particular type of topologically nontrivial band structure. Here, the authors report neutron scattering studies of one such magnetic Weyl semimetal candidate material, Eu${}_{1\ensuremath{-}x}$Sm${}_{x}$TiO${}_{3}$. The formation and character of magnetic order are tracked under applied magnetic field as a means of understanding the unusual magnetoresistance in this compound. Direct correlations between a field-driven spin-flop transition and depth-dependent magnetism are discussed as the origins of the previously reported anisotropic magnetoresistance and topological Hall effect for this material.