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Granular Superconductivity in Hydrides Under Pressure

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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.

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Acknowledgements

The author is grateful to Yang Ding and Frank Marsiglio for stimulating discussions.

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  1. Department of Physics, University of California, La Jolla, San Diego, CA, 92093-0319, USA

    J. E. Hirsch

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Hirsch, J.E. Granular Superconductivity in Hydrides Under Pressure. J Supercond Nov Magn 35, 2731–2736 (2022). https://doi.org/10.1007/s10948-022-06340-3

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