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Magnetic topological semimetals have attracted intense attention recentlysince these materials carry a great promise for potential applications in novelspintronic devices. Here, we report an intimate interplay between lattice, Eumagnetic order and topological semimetallic behavior inEu$_{1-x}$Sr$_{x}$MnSb$_{2}$ driven by nonmagnetic Sr doping on magnetic Eusite. Different types of Eu spin reorientations are controllable by the Srconcentration, temperature or magnetic field, and coupled to the quantumtransport properties of Dirac fermions generated by the 2D Sb layers. Our studyopens a new pathway to achieving exotic magnetic order and topologicalsemimetallic state via controlling spin reorientation. The effective strategyof substituting rare-earth site by nonmagnetic element demonstrated here may beapplicable to the AMnCh$_{2}$ (A=rare-earth elements; Ch=Bi/Sb) family and awide variation of other layered compounds involving spatially separatedrare-earth and transition metal layers.

Tuning quantum transport by controlling spin reorientations in Dirac semimetal candidates Eu$_{1-x}$Sr$_{x}$MnSb$_{2}$