Titel
Temporal Evolution of Defects and Related Electric Properties in He-Irradiated YBa2Cu3O7−δ Thin Films
Autor*in
Sandra Keppert
Institute of Applied Physics, Johannes Kepler University Linz
Autor*in
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Abstract
Thin films of the superconductor YBa2Cu3O7−δ (YBCO) were modified by low-energy light-ion irradiation employing collimated or focused He+ beams, and the long-term stability of irradiation-induced defects was investigated. For films irradiated with collimated beams, the resistance was measured in situ during and after irradiation and analyzed using a phenomenological model. The formation and stability of irradiation-induced defects are highly influenced by temperature. Thermal annealing experiments conducted in an Ar atmosphere at various temperatures demonstrated a decrease in resistivity and allowed us to determine diffusion coefficients and the activation energy Δ𝐸=(0.31±0.03) eV for diffusive oxygen rearrangement within the YBCO unit cell basal plane. Additionally, thin YBCO films, nanostructured by focused He+-beam irradiation into vortex pinning arrays, displayed significant commensurability effects in magnetic fields. Despite the strong modulation of defect densities in these pinning arrays, oxygen diffusion during room-temperature annealing over almost six years did not compromise the signatures of vortex matching, which remained precisely at their magnetic fields predicted by the pattern geometry. Moreover, the critical current increased substantially within the entire magnetic field range after long-term storage in dry air. These findings underscore the potential of ion irradiation in tailoring the superconducting properties of thin YBCO films.
Stichwort
cuprate superconductorhelium-ion irradiationlong-term stabilityirradiation damage healingvortex pinningroom-temperature annealingdiffusion coefficientsactivation energycommensurability effects
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:2080704
Erschienen in
Titel
International Journal of Molecular Sciences
Band
25
Ausgabe
14
ISSN
1422-0067
Erscheinungsdatum
2024
Verlag
MDPI AG
Projektnummer
I4865-N – Austrian Science Fund (FWF)
Projektnummer
CA21144 – European Union (all programmes)
Projektnummer
CA19140 – European Union (all programmes)
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Erscheinungsdatum
2024
Zugänglichkeit
Rechteangabe
© 2024 by the authors

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