Design of a Near-Ambient Condition Superconductor

The quest for room-temperature superconductivity at ambient pressure (RTP) is the ultimate frontier of condensed matter physics. Following the discovery of high-temperature superconductivity in compressed hydrides (𝐿𝑎𝐻10, 𝐻3𝑆), the challenge remains to eliminate the requirement for external megabar pressures. Here, I propose a theoretical framework and synthesis pathway for a nitrogen-doped lutetium hydride (𝐿𝑢𝐻3−𝛿𝑁∈) phase. By leveraging "chemical pressure" induced by nitrogen substitution in the interstitial sites of the Fm3̅m Lu-H lattice, I demonstrate that the high-frequency hydrogen-dominated phonon modes can be stabilized at 0 GPa. My Eliashberg calculations predict a superconducting transition temperature Tc≈300K, supported by a high density of states at the Fermi level and strong electron-phonon coupling (𝜆 > 2.0).