Ternary superconducting hydrides in the La-Mg-H system

Abstract: Ternary or more complex hydrogen-rich hydrides are the main hope of reaching room-temperature superconductivity at high pressures. Their chemical space is vast and its exploration is challenging. Here we report the investigation of the La-Mg-H ternary system using the evolutionary algorithm USPEX at pressures on the range 150-300 GPa. Several ternary superconducting hydrides were found, including thermodynamically stable $P6/mmm$-LaMg${3}$H${28}$ with $T_{\mathrm{C}}=164$ K at 200 GPa, $P/2m$-LaMgH$8$, $C2/m$-La$_2$MgH${12}$ and $P2/m$-La$3$MgH${16}$. In addition, novel binary hydrides were predicted to be stable at various pressures, such as $Cm$-Mg$6$H${11}$, $P1$-MgH${26}$, $Fmm2$-MgH${30}$, $P1$-MgH${38}$ and $R\overline{3}m$-LaH${13}$. We also report several novel low-enthalpy metastable phases, both ternary and binary ones. Finally, we demonstrate important methods of exploring very large chemical spaces and show how they can improve crystal structure prediction.