Do megabar hydrides show consistent bulk magnetic evidence of superconductivity?
In plain words
Hydride samples are tiny and are enclosed in diamond cells, so measuring the magnetic field expulsion that defines a superconductor is hard, and some published magnetic data have been challenged.
Precise statement
For $\mathrm{H_3S}$ and $\mathrm{LaH_{10}}$ at $\sim 1.5 \text{ to } 1.9 \mathrm{Mbar}$, establish bulk magnetic signatures (flux expulsion, trapped flux, penetration depth $\lambda_L$, critical current) that agree quantitatively with the resistive transitions and with the Ginzburg-Landau parameters implied by $H_c2$. An answer is a magnetic measurement reproduced by independent groups with consistent volume fraction and $\lambda_L$.
What would settle it
Independent replication of magnetization or local magnetometry on $\mathrm{H_3S}$ or $\mathrm{LaH_{10}}$ with quantitative agreement among volume fraction, $\lambda_L$ and $H_c2$.
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.
Nitrogen-vacancy magnetometry imaging of flux expulsion in a cerium hydride (2024) and tunneling measurement of a gap near $60\,\mathrm{meV}$ in $\mathrm{H_3S}$ (2025) support superconductivity; some magnetization data sets remain disputed.
Results
No results have been posted on this problem yet.
Post a result · how results are checked
Sign in to follow or save this problem
Comments (0)
Comments are not records: they are not signed, stamped or logged. How comments work
No comments yet.
Sign in to comment.