High-temperature superconductivity in atomic metallic hydrogen

Superconductivity in the recently proposed ground-state structures of atomic metallic hydrogen is calculated over the pressure range 500 GPa to 3.5 TPa. Near molecular dissociation, the electron-phonon coupling λ and renormalized Coulomb repulsion are similar to the molecular phase. A nearly continuous increase in the critical temperature Tc with pressure is thus predicted in this range, to ∼356 K near 500 GPa. As the atomic phase stabilizes with increasing pressure, λ increases, causing Tc to approach 481 K near 700 GPa. At the first atomic-atomic structural phase transformation near 1–1.5 TPa, a discontinuous jump in λ occurs, causing Tc to increase up to 764 K.