Abstract
Vortex activation energy in the AC magnetic response of superconductors takes unexpectedly high values around the DC irreversibility line, especially at low DC magnetic fields. It is shown that this is the result of a non-diffusive, thermally activated vortex hopping at short-time scales, where the hopping length overcomes the distance between the pinning centers. Vortex pinning remains significant even above the DC irreversibility line (in the “pinned” vortex liquid domain), owing to the incomplete smearing of the vortex pinning potential by thermal vortex fluctuations for a short pinning time.
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Acknowledgements
Work supported by the Romanian Ministry of Research and Innovation through POC (European Regional Development Fund, Operational Fund Competitiveness), Project P-37_697, number 28/01.09.2016, and PED88/2016. The kind assistance of the Alexander von Humboldt Foundation is gratefully acknowledged.
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Miu, L. et al. (2020). High Vortex Activation Energies in the AC Magnetic Response of Superconductors Close to the DC Irreversibility Line. In: Mele, P., et al. Superconductivity. Springer, Cham. https://doi.org/10.1007/978-3-030-23303-7_6
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