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The B20 chiral magnets with broken inversion symmetry and C4 rotationsymmetry have attracted much attention. The broken inversion symmetry leads tothe Dzyaloshinskii-Moriya that gives rise to the helical and Skyrmion states.We report the unusual magnetoresistance (MR) of B20 chiral magnetFe0.85Co0.15Si that directly reveals the broken C4 rotation symmetry. Wepresent a microscopic theory, a minimal theory with two spin-orbit terms, thatsatisfies all the symmetry requirements and accounts for the transportexperiments.

Magnetoresistance due to Broken C4 Symmetry in Cubic B20 Chiral Magnets