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Recent theoretical and experimental studies of hydrogen-rich materials atmegabar pressures (i.e., >100 GPa) have led to the discovery of veryhigh-temperature superconductivity in these materials. Lanthanum superhydrideLaH$_{10}$ has been of particular focus as the first material to exhibit asuperconducting critical temperature (T$_c$) near room temperature. Experimentsindicate that the use of ammonia borane as the hydrogen source can increase theconductivity onset temperatures of lanthanum superhydride to as high as 290 K.Here we examine the doping effects of B and N atoms on the superconductivity ofLaH$_{10}$ in its fcc (Fm-3m) clathrate structure at megabar pressures. Dopingat H atomic positions strengthens the H$_{32}$ cages of the structure to givehigher phonon frequencies that enhance the Debye frequency and thus thecalculated T$_c$. The predicted T$_c$ can reach 288 K inLaH$_{9.985}$N$_{0.015}$ within the average high-symmetry structure at 240 GPa.

Room-Temperature Superconductivity in Boron-Nitrogen Doped Lanthanum Superhydride