One-Dimensional Hydrogen Chains in Li-Hf-H System: A Pathway to High Superconductivity Under High Pressure.

ABSTRACT: The recent discovery of high-critical-temperature (high-T_c) superconductivity in hydrides such as H₃S and LaH₁₀ has significantly advanced the quest for room-temperature superconductors. This work reports a new class of high-T_c hydrides in the Li-Hf-H system characterized by unknown one-dimensional (1D) hydrogen chains. Through structure prediction methods and first-principles calculations, the thermodynamically stable compound LiHfH₂₀ is discovered, exhibiting a remarkable T_c of 222 K at 260 GPa. Notably, the distinct 1D hydrogen chains in LiHfH₂₀ facilitate strong coupling between high-frequency phonon modes and hydrogen-derived electronic states near the Fermi level, significantly enhancing superconductivity. E

SUBMITTER: Yang K 

PROVIDER: S-EPMC12697900 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature