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Article

Pinning Potential of the Self-Assembled Artificial Pinning Centers in Nanostructured YBa2Cu3O7−x Superconducting Films

1
National Institute of Materials Physics, 405A Atomistilor Str., 077125 Magurele, Romania
2
National Institute for Laser, Plasma & Radiation Physics, 409 Atomistilor Str., 077125 Magurele, Romania
3
Department of Physics “E.R. Caianiello”, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Italy
4
QMatterPhotonics, Departamento de Física de Particulas, and Instituto de Materiais (iMATUS), Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: M.V. Ramallo
Nanomaterials 2022, 12(10), 1713; https://doi.org/10.3390/nano12101713
Received: 14 April 2022 / Revised: 9 May 2022 / Accepted: 13 May 2022 / Published: 17 May 2022
(This article belongs to the Special Issue Superconductivity in Nanosystems)
For high-field power applications of high-temperature superconductors, it became obvious in recent years that nano-engineered artificial pinning centers are needed for increasing the critical current and pinning potential. As opposed to the artificial pinning centers obtained by irradiation with various particles, which is a quite expensive approach, we have studied superconducting samples having self-assembled defects, created during the sample fabrication, that act as effective pinning centers. We introduced a simple, straight-forward method of estimating the frequency-dependent critical current density by using frequency-dependent AC susceptibility measurements, in fixed temperatures and DC magnetic fields, from the positions of the maxima in the dependence of the out-of-phase susceptibility on the amplitude of AC excitation magnetic field. The results are compatible with a model that stipulates a logarithmic dependence of the pinning potential on the probing current. A mathematical derivation allowed us to estimate from the experimental data the pinning potentials in various samples, and in various DC magnetic fields. The resulted values indicate large pinning potentials, leading to very small probability of magnetic flux escaping the pinning wells, hence, leading to very high critical currents in high magnetic fields. View Full-Text
Keywords: superconducting films; multilayers; nanoscale defects; artificial pinning centers; critical current density; pinning potential superconducting films; multilayers; nanoscale defects; artificial pinning centers; critical current density; pinning potential
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MDPI and ACS Style

Ivan, I.; Ionescu, A.M.; Crisan, D.N.; Andrei, A.; Galluzzi, A.; Polichetti, M.; Mosqueira, J.; Crisan, A. Pinning Potential of the Self-Assembled Artificial Pinning Centers in Nanostructured YBa2Cu3O7−x Superconducting Films. Nanomaterials 2022, 12, 1713. https://doi.org/10.3390/nano12101713

AMA Style

Ivan I, Ionescu AM, Crisan DN, Andrei A, Galluzzi A, Polichetti M, Mosqueira J, Crisan A. Pinning Potential of the Self-Assembled Artificial Pinning Centers in Nanostructured YBa2Cu3O7−x Superconducting Films. Nanomaterials. 2022; 12(10):1713. https://doi.org/10.3390/nano12101713

Chicago/Turabian Style

Ivan, Ion, Alina M. Ionescu, Daniel N. Crisan, Andreea Andrei, Armando Galluzzi, Massimiliano Polichetti, Jesus Mosqueira, and Adrian Crisan. 2022. "Pinning Potential of the Self-Assembled Artificial Pinning Centers in Nanostructured YBa2Cu3O7−x Superconducting Films" Nanomaterials 12, no. 10: 1713. https://doi.org/10.3390/nano12101713

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