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The discovery of superconducting H 3 S with a critical temperature  T   c  ∼200 K opened a door to room temperature superconductivity and stimulated further extensive studies of hydrogen-rich compounds stabilized by high pressure. Here, we report a comprehensive study of the yttrium-hydrogen system with the highest predicted  T   c  s among binary compounds and discuss the contradictions between different theoretical calculations and experimental data. We synthesized yttrium hydrides with the compositions of YH 3 , YH 4 , YH 6  and YH 9  in a diamond anvil cell and studied their crystal structures, electrical and magnetic transport properties, and isotopic effects. We found superconductivity in the  Im-3m  YH 6  and  P6  3  /mmc  YH 9  phases with maximal  T   c  s of ∼220 K at 183 GPa and ∼243 K at 201 GPa, respectively.  Fm-3m  YH 10  with the highest predicted  T   c   > 300 K was not observed in our experiments, and instead, YH 9  was found to be the hydrogen-richest yttrium hydride in the studied pressure and temperature range up to record 410 GPa and 2250 K.

Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure