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Sr2IrO4 is a magnetic insulator assisted by strong spin-orbit coupling (SOC)whereas the Sr2RuO4 is a p-wave superconductor. The contrasting ground stateshave been shown to result from the critical role of the strong SOC in theiridate. Our investigation of structural, transport, and magnetic propertiesreveals that substituting 4d Ru4+ (4d4) ions for 5d Ir4+(5d5) ions in Sr2IrO4directly adds holes to the t2g bands, reduces the SOC and thus rebalances thecompeting energies in single-crystal Sr2Ir1-xRuxO4. A profound effect of Rudoping driving a rich phase diagram is a structural phase transition from adistorted I41/acd to a more ideal I4/mmm tetragonal structure near x=0.50 thataccompanies a phase transition from an antiferromagnetic-insulating state to aparamagnetic-metal state. We also make a comparison drawn with Rh dopedSr2IrO4, highlighting important similarities and differences.

From Jeff=1/2 insulator to p-wave superconductor in single-crystal Sr2Ir1-xRuxO4 (0 < x< 1)