Pressure-induced superconductivity in La${}_4$Ni${}_3$O${}_{10+\delta }$ ($\delta$ = 0.04 and -0.01)

The superconducting transition temperatures, $T_{\mathrm{c}}$, of La${}_4$Ni${}_3$O${}_{10+\delta }$($\delta$ = 0.04 and -0.01) were determined under various pressures up to 124.9 GPa by electrical resistance measurements with a diamond anvil cell. $T_{\mathrm{c}}$ exhibits a strong dependence on oxygen content within the pressure range of approximately 20 GPa and 80 GPa. At 48.0 GPa, $T_{\mathrm{c}}$ of La${}_4$Ni${}_3$O${}_{10.04}$ peaks at 36 K, marking the highest $T_{\mathrm{c}}$ reported thus far.