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Granular Superconductivity in Hydrides under Pressure
Version 1
: Received: 25 April 2022 / Approved: 27 April 2022 / Online: 27 April 2022 (08:03:11 CEST)
How to cite: Hirsch, J. Granular Superconductivity in Hydrides under Pressure. Preprints 2022, 2022040251. https://doi.org/10.20944/preprints202204.0251.v1 Hirsch, J. Granular Superconductivity in Hydrides under Pressure. Preprints 2022, 2022040251. https://doi.org/10.20944/preprints202204.0251.v1
Abstract
It has been suggested that the measured magnetic properties of hydrides under pressure claimed to be high temperature superconductors indicate that the materials are granular superconductors. Such materials will show reduced or no magnetic field expulsion under field cooling, and will trap magnetic fields when the external magnetic field is removed. They will also exhibit hysteretic behavior in magnetoresistance and other transport properties. Here we point out that hysteresis in transport properties has never been reported for hydrides under pressure. Its presence, with the expected features, would indicate that the materials trap magnetic flux, hence that they can sustain persistent currents without dissipation, something that all superconductors can do. Conversely, its absence would indicate that these materials are not superconductors.
Keywords
granular superconductors; trapped flux; hysteresis; magnetoresistance; critical current
Subject
Physical Sciences, Condensed Matter Physics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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