Few-Hydrogen High-<i>T</i><sub>c</sub> Superconductivity in (Be<sub>4</sub>)<sub>2</sub>H Nanosuperlattice with Promising Ductility under Ambient Pressure.
basic_science · Level V
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- Record sourced from PubMed, PMID 37602837.
- Also identified by DOI 10.1021/acs.nanolett.3c02213.
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Abstract
The multi-hydrogen lanthanum hydride LaH<sub>10</sub> is well recognized as having the highest critical temperature (<i>T</i><sub>c</sub>) of 250-260 K under unrealistically ultrahigh pressures of about 170-200 GPa. Here, we propose a novel idea for designing a new ambient-pressure high-<i>T</i><sub>c</sub> superconductor by inserting a hexagonal H-monolayer into two close-packed Be monolayers to form a new and stable few-hydrogen metal-bonded layered beryllium hydride (Be<sub>4</sub>)<sub>2</sub>H nanosuperlattice, with better ductility than multi-hydrogen, cuprate, and iron-based superconductors, completely contrary to the conventional design strategy for multi-hydrogen covalent high-<i>T</i><sub>c</sub> superconductors with poor ductility at several hundred GPa. We find that (Be<sub>4</sub>)<sub>2</sub>H is a phonon-mediated Eliashberg superconductor with a large electron-phonon coupling constant of 1.41 and a high <i>T</i><sub>c</sub> of 84-72 K with Coulomb repulsion pseudopotential μ* = 0.07-0.13. Importantly, (Be<sub>4</sub>)<sub>2</sub>H is the only new high-<i>T</i><sub>c</sub> superconductor and fills the gap in the absence of ambient-pressure superconductors around the liquid-nitrogen temperature with good ductility, which is highly beneficial for practical applications.