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We study possible Weyl semimetals of strongly-correlated electrons byinvestigating magnetotransport properties in pyrochlore R2Ir2O7 (R=rare-earthions), choosing three types of R ions to design the exchange coupling schemebetween R 4f and Ir 5d moments; non-magnetic Eu (4f6), isotropic Gd (4f7), andanisotropic Tb (4f8). In the doping-induced semimetallic state, distinctivefeatures of magnetoresistance and Hall effect are observed in R=Gd and Tbcompounds due to the effects of the exchange-enhanced isotropic and anisotropicZeeman fields, respectively, exemplifying the double Weyl semimetal and the2-in 2-out line-node semimetal as predicted by theories. In particular, a Hallangle of R=Gd compound is strongly enhanced to 1.5 % near above the criticaldoping for the Mott transition. Furthermore, an unconventional Hallcontribution is discerned for a lower doping regime of R=Gd compound, which canbe ascribed to the emergence of Weyl points with the field-distorted all-inall-out order state. These findings indicate that the hole-doping induced Motttransition as well as the characteristic f-d exchange interaction stabilizesversatile topological semimetal states in a wide range of material parameterspace.

Evolution of possible Weyl semimetal states across the hole-doping induced Mott transition in pyrochlore iridates