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The $f$-$d$ magnetic exchange interaction is considered to be a keyingredient for many exotic topological phases in pyrochlore iridates. Here, wehave investigated the evolution of structural, magnetic and electronicproperties in doped pyrochlore iridate, (Y$_{1-x}$Pr$_x$)$_2$Ir$_2$O$_7$. Apartfrom geometrical frustration, pyrochlore iridates are well known for its activespin-orbit coupling effect. The substitution of Pr$^{3+}$ (4$f^2$) for thenonmagnetic Y$^{3+}$ (4$d^0$) acts as a magnetic doping, which provides anideal platform to study $f$-$d$ exchange interaction without altering theIr-sublattice. With Pr substitution, system retains its original cubicstructural symmetry but the local structural parameters show an evolution withthe doping concentration $x$. The robust magnetic-insulating state inY$_2$Ir$_2$O$_7$ is drastically weakened, while Pr$_2$Ir$_2$O$_7$ ($x$ = 1.0)shows a paramagnetic-metallic behavior. A metal-insulator transition isobserved for $x$ = 0.8 sample. This evolution of magnetic and electronicproperties are believed to be induced by an exchange interaction betweenlocalized Pr-4$f$ and itinerant Ir-5$d$ electrons as well as by an increasedhybridization between Ir-$t_{2g}$ and (basal) O-$p$ orbitals as observed in XASstudy. The resistivity in insulating materials follows a power-law behaviorwith a decreasing exponent with $x$. A negative magnetoresistance is observedfor present series of samples at low temperature and where themagnetoresistance shows a quadratic field dependence at higher fields.

physical review. b./physical review. b

Magnetic and transport properties in pyrochlore iridates  (Y$_{1-x}$Pr$_x$)$_2$Ir$_2$O$_7$: The role of $f$-$d$ exchange interaction  and $d$-$p$ orbital hybridization