Evidence against superconductivity in flux trapping experiments on hydrides under high pressure & On magnetic field screening and expulsion in hydride superconductors

TL;DR

This paper challenges recent claims of superconductivity in hydrides under high pressure by analyzing flux trapping experiments and showing the results are likely artifacts or due to magnetic properties unrelated to superconductivity.

Contribution

It provides a critical re-evaluation of flux trapping experiments, arguing that these hydrides do not exhibit true superconducting behavior under high pressure.

Findings

Flux trapping results are likely artifacts or due to magnetic properties unrelated to superconductivity.

Hydrides under high pressure do not demonstrate magnetic flux trapping indicative of superconductivity.

Analysis supports the conclusion that these materials are not superconductors.

Abstract

It has recently been reported that hydrogen-rich materials under high pressure trap magnetic flux, a tell-tale signature of superconductivity [arXiv:2206.14108v1]. Here we point out that under the protocol used in these experiments the measured results indicate that the materials don't trap magnetic flux. Instead, the measured results are either experimental artifacts or originate in magnetic properties of the sample or its environment unrelated to superconductivity, Together with other experimental evidence analyzed earlier, this clearly indicates that these materials are not superconductors. {\bf In a second part, we discuss magnetic field screening and expulsion.}