English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this work, we resolve conflicting experimental and theoretical findingsrelated to the dynamical stability and superconducting properties of$Fm\overline{3}m$-LuH$_3$, which was recently suggested as the parent phaseharboring room-temperature superconductivity at near-ambient pressures.Including temperature and quantum anharmonic lattice effects in ourcalculations, we demonstrate that the theoretically predicted structuralinstability of the $Fm\overline{3}m$ phase near ambient pressures is suppressedfor temperatures above $200\,\text{K}$. We provide a $p\,\unicode{x2013}\,T$phase diagram for stability up to pressures of $6\,\text{GPa}$, where therequired temperature for stability is reduced to $T>80\,\text{K}$. We alsodetermine the superconducting critical temperature $T_\text{c}$ of$Fm\overline{3}m$-LuH$_3$ within the Migdal-Eliashberg formalism, usingtemperature- and quantum-anharmonically-corrected phonon dispersions, findingthat the expected $T_\text{c}$ for electron-phonon mediated superconductivityis in the range of $50$ $\unicode{x2013}$ $60\,\text{K}$, i.e., well below thetemperatures required to stabilize the lattice. When considering moderatedoping based on rigidly shifting the Fermi level, $T_\text{c}$ decreases forboth hole and electron doping. Our results thus provide evidence that anyobserved room-temperature superconductivity in pure or doped$Fm\overline{3}m$-LuH$_3$, if confirmed, cannot be explained by a conventionalelectron-phonon mediated pairing mechanism.

Temperature and quantum anharmonic lattice effects on stability and superconductivity in lutetium trihydride