Tunable magnetoresistance driven by electronic structure in Kagome semimetal Co1−xFe<i>x</i>Sn

Topological quantum phenomena due to the presence of both Dirac fermions and flat bands in Kagome semimetal CoSn promise novel transport properties. In materials, properties can be enhanced by moving position band with doping. Here, we have investigated magnetotransport electronic Fe doping CoSn. A large positive magnetoresistance (MR) ≈ 105% at 3 K 8 T magnetic field has been observed Co1−xFexSn gives rise negative MR a value for x = 0.2 (−8.4%) but decreases 0.3 (−3.7%) 0.4 (−2.7%). Tuning from values is associated changes energy localized emergence quasi-localized states near Fermi level. The systematic variation increasing depends on structural increase lattice parameters neighbor interactions Sn atoms Co plane. origin electron hopping strength localization that leads tunable Co1−xFexSn.