Effect of isoelectronic doping on the honeycomb-lattice iridate A 2 IrO 3

  title={Effect of isoelectronic doping on the honeycomb-lattice iridate A 2 IrO 3},
  author={Soham Manni and Sungkyun Choi and Igor I. Mazin and R Coldea and Michaela Altmeyer and Harald O. Jeschke and Roser Valent{\'i} and Philipp Gegenwart},
  journal={Physical Review B},
We have investigated experimentally and theoretically the series (Na$_{1-x}$Li$_{x}$)$_{2}$IrO$_{3}$. Contrary to what has been believed so far, only for $x\leq0.25$ the system forms uniform solid solutions. For larger Li content, as evidenced by powder X-ray diffraction, scanning electron microscopy and density functional theory calculations, the system shows a miscibility gap and a phase separation into an ordered Na$_{3}$LiIr$_2$O$_{6}$ phase with alternating Na$_3$ and LiIr$_2$O$_6$ planes… 
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