Physical Properties of new A$_{2}T$O$_{3}$ ($A = $ Na, Li, $T = $ Ru, Rh, Ir) materials

The layered iridates $A_{2}$IrO$_{3}$ ($A \quad =$ Na, Li) have recently been suggested to be spin-orbit driven Mott insulators with their magnetism being consistent with an extended Kitaev-Heisenberg model [1-6]. While Na$_{2}$IrO$_{3}$ was found to lie deep in a magnetically ordered region, Li$_{2}$IrO$_{3}$ was suggested to lie close to the spin-liquid state expected in the strong Kitaev limit [6]. To explore the effect of chemical pressure and the effect of varying the spin-orbit coupling we have synthesized the new materials Li$_{2}$RhO$_{3}$, Na$_{2}$RuO$_{3}$, and Na$_{2}$Ir$_{\mathrm{1-x}}$Ru$_{\mathrm{x}}$O$_{3}$. We will present magnetic, electrical transport, and heat capacity measurements on these materials.\\[4pt] [1] Y. Singh and P. Gegenwart, Phys. Rev. B \textbf{82}, 064412 (2010).\\[0pt] [2] Y. Singh et al., Phys. Rev. Lett. \textbf{108}, 127203 (2012)\\[0pt] [3] S. K. Choi et al., Phys. Rev. Lett. \textbf{108}, 127204 (2012).\\[0pt] [4] F. Ye et al., Phys. Rev. B \textbf{85}, 180403 (2012)\\[0pt] [5] R. Commin, et al., Phys. Rev. Lett. (in press) 2012.\\[0pt] [6] J. Chaloupka, G. Jackeli, and G. Khaliullin, Phys. Rev.Lett. \textbf{105}, 027204 (2010).