Abstract
The crystal structure, resistivity, and magnetic susceptibility of the Li2Ir1-xRuxO3 (x = 0-1) polycrystals have been investigated. We found that the parent antiferromagnetic phase disappears for x > 0.2 and bond dimers appear in the averaged structure for x > 0.5 and likely fluctuate for much smaller x. Unexpectedly, this system remains insulating for all the doping levels, in sharp contrast with the robust metallic state found in Sr2Ir1-xRuxO4. These results demonstrate that the essential physics of the doped A2IrO3 (A = Li, Na) system deviates significantly from the common one-band jeff=1/2 spin-orbit model.
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