Is 298 K superconductivity in compressed La-Sc-H reproducible?
This text mentions work from 2024 on. Those parts were partly written without a live literature search and have not been checked by an editor yet.
In plain words
A 2025 report claims that a hydrogen-rich compound of lanthanum and scandium superconducts up to about room temperature when squeezed to about 2.5 million atmospheres; independent confirmation is required.
Precise statement
Song et al. (arXiv 2510.01273, 2025) report onset $T_c = 271\ \text{to}\ 298\,\mathrm{K}$ at $1.95\ \text{to}\ 2.66\,\mathrm{Mbar}$ in hexagonal $\mathrm{LaSc_2H_{24}}$, synthesized by laser heating La-Sc alloy with ammonia borane in diamond anvil cells, with zero resistance, field suppression of $T_c$ and synchrotron diffraction. Determine whether independent groups reproduce $T_c$ above $270\,\mathrm{K}$ in the same structure, and whether magnetic signatures (flux expulsion, trapped flux) and the isotope coefficient agree with Eliashberg predictions for $\mathrm{LaSc_2H_{24}}$. An answer is independent replication with magnetic data, or failure to reproduce under the stated synthesis.
What would settle it
Independent synthesis of $\mathrm{LaSc_2H_{24}}$ with resistive and magnetic transitions above 270 K at a calibrated pressure, plus a deuterium isotope measurement.
Status in the literature
Unverified note: it names recent work and was partly written without a live literature search; it awaits a check by an editor.
Reported in September 2025 by a single group; independent replication had not been confirmed as of this entry (October 2026).
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