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Pure hydrogen is predicted to become a metal, and possibly a room-temperature superconductor, at still higher pressure.","title":"Superconducting hydrides and metallic hydrogen at megabar pressures","topic_ref":null,"why":"They are the highest-$T_{\\mathrm{c}}$ superconductors known and test whether conventional phonon-mediated theory predicts $T_{\\mathrm{c}}$ from first 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