The nominating institution Max-Planck-Gesellschaft on the breakthrough:

The quest for unusual materials, such as metallic hydrogen or room-temperature superconductors, has been going on for decades. Mikhail Eremets has pioneered high pressure experiments to induce such states, which brought about innovations in materials science, but also high-pressure technology. The group has achieved recent breakthroughs in this field, including superconductivity at 203K in H3S (2015) and at 250 K in LaH10 (2019), or semimetallic hydrogen above 250 GPa (2019).