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Effect of isoelectronic doping on the honeycomb-lattice iridate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>A</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">IrO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
This thorough experimental and theoretical investigation of (Na${}_{1-x}$ Li${}_{x}$)${}_{2}$IrO${}_{3}$ clearly reveals that there is phase segregation for x larger than 0.25, extending the previoulsy proposed quantum critical region.