Anisotropic resistance with a 90o twist in a ferromagnetic Weyl semimetal, Co2MnGa

This is the authors' abstract. We don't add key points for this paper.

Co2MnGa is a ferromagnetic semimetal with Weyl nodal lines identified by ARPES. We studied electrical transport in thin Co2MnGa lamellae (10 x 10 x 0.4-5 μm) cut from single-crystals using a focused ion beam. These crystals exhibit an unexpected and highly unusual planar resistance anisotropy (10X) with principal axes that rotate by 90o between the upper and lower faces. Using symmetry arguments and simulations, we find that the observed resistance anisotropy resembles that of an isotropic conductor with anisotropic surface states that are impeded from hybridization with bulk states. The origin of these states awaits further experiments that can correlate the surface bands with the observed 90o-twist geometry.