Abstract
Persistent currents in polycrystalline YBa2Cu3O7 rings have been investigated by measuring the spatial distribution of the magnetic flux trapped in field-cooled samples. The results unambiguously show that macroscopic persistent ring currents exist. The critical current density depends very sensitively on the sample quality, reachingj c ≈250 A/cm2 at 77 K for our best samples.
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Leiderer, P., Feile, R. Macroscopic persistent currents in YBa2Cu3O7 . Z. Physik B - Condensed Matter 70, 141–144 (1988). https://doi.org/10.1007/BF01318291
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DOI: https://doi.org/10.1007/BF01318291