Evolution of magnetic and transport properties in hole doped Y₂Ir₂O₇

We report the effect of Ru⁴⁺ substitution at Ir-site on structural, magnetic and electrical properties in pyrochlore iridate Y₂Ir₂O₇. Structural investigation has been done using x-ray powder diffraction and Rietveld analysis for both samples. There is no structural phase transition with Ru doping. Magnetization study shows that on slightly substitution of Ru at Ir-site effectively shifts the magnetic irreversible temperature T _irr towards low temperature and reduce the bifurcation between M _ZFC and M _FC branches. The electrical resistivity shows an insulating behavior in whole temperature range, however, resistivity decreases with doping of Ru. (paper)