Do megabar hydrides show consistent bulk magnetic evidence of superconductivity? · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title · changed
Revision 1: Do megabar hydrides show consistent bulk magnetic evidence of superconductivity
Revision 2: Do megabar hydrides show consistent bulk magnetic evidence of superconductivity?
Plain
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 · changed · core
Revision 1: For H3S and LaH10 at ~ 1.5 to 1.9 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 $\lambda_L$.
Revision 2: 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 $\lambda_L$.
Settled by · changed · core
Revision 1: Independent replication of magnetization or local magnetometry on H3S or LaH10 with quantitative agreement among volume fraction, $\lambda_L$ and H_c2.
Revision 2: Independent replication of magnetization or local magnetometry on $\mathrm{H_3S}$ or $\mathrm{LaH_{10}}$ with quantitative agreement among volume fraction, $\lambda_L$ and $H_c2$.
Kind
well-posed
Answer type
yes-no
References
(empty)
Literature status
partially-resolved
Status note · changed
Revision 1: Nitrogen-vacancy magnetometry imaging of flux expulsion in a cerium hydride (2024) and tunneling measurement of a gap near $60\,\mathrm{meV}$ in H3S (2025) support superconductivity; some magnetization data sets remain disputed.
Revision 2: 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.
Posed since
2015

Decisions