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The S-s’-S and S-N-S type superconductive junctions on YBCO material

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Titel: The S-s’-S and S-N-S type superconductive junctions on YBCO material
Autoren: Patrice Umenne
Quelle: Next Materials, Vol 7, Iss , Pp 100635- (2025)
Verlagsinformationen: Elsevier, 2025.
Publikationsjahr: 2025
Bestand: LCC:Technology
Schlagwörter: Atomic Force Microscope (AFM), Femtosecond laser, ICRn product, Local heating, Normal resistance Rn, Superconductive junctions, Technology
Beschreibung: In this paper an S-s’-S and an S-N-S junctions were fabricated using the femtosecond laser. The femtosecond laser was used because it has a short pulse duration on a thin film material and can reduce the thermal degradation of a superconductive thin film material. The S-s’-S junction is a micron sized constriction with a width of 2.1 μm, while the S-N-S junction is a sub-micron sized constriction with a width of 816 nm. The S-N-S junction due to its sub-micron width experiences more local heating from the femtosecond laser and as a result the superconductive material in the center normalizes producing the S-N-S junction. Its normal resistance (Rn) shows exponential growth versus temperature behaving like a normalized metallic material. The S-s’-S junction has a micron width, is less damaged by the localized heating of the femtosecond laser in the center of the constriction and as a result produces a geometrically reduced superconductive phase s’. The normal resistance versus temperature curve for the S-s’-S constriction remains constant in the lower temperature range and then increases in the high temperature behaving like a reduced superconductive material. The IcRn product for the S-s’-S junction begins at 13.1 mV at 6 K while the IcRn product for the S-N-S junction begins at 1.9 mV at 8 K. The IcRn products decrease with temperature. The novelty of the work is that the paper shows the Rn and IcRn behavior of an S-s’-S and S-N-S type junctions fabricated strictly with the femtosecond laser. The paper also shows the Shapiro steps of the junctions. The optical equipment used to shape the laser beam have been described.
Publikationsart: article
Dateibeschreibung: electronic resource
Sprache: English
ISSN: 2949-8228
Relation: http://www.sciencedirect.com/science/article/pii/S2949822825001534; https://doaj.org/toc/2949-8228
DOI: 10.1016/j.nxmate.2025.100635
Zugangs-URL: https://doaj.org/article/8f80f55fb4984d0e8e2926f3a078250d
Dokumentencode: edsdoj.8f80f55fb4984d0e8e2926f3a078250d
Datenbank: Directory of Open Access Journals
Beschreibung
Abstract:In this paper an S-s’-S and an S-N-S junctions were fabricated using the femtosecond laser. The femtosecond laser was used because it has a short pulse duration on a thin film material and can reduce the thermal degradation of a superconductive thin film material. The S-s’-S junction is a micron sized constriction with a width of 2.1 μm, while the S-N-S junction is a sub-micron sized constriction with a width of 816 nm. The S-N-S junction due to its sub-micron width experiences more local heating from the femtosecond laser and as a result the superconductive material in the center normalizes producing the S-N-S junction. Its normal resistance (Rn) shows exponential growth versus temperature behaving like a normalized metallic material. The S-s’-S junction has a micron width, is less damaged by the localized heating of the femtosecond laser in the center of the constriction and as a result produces a geometrically reduced superconductive phase s’. The normal resistance versus temperature curve for the S-s’-S constriction remains constant in the lower temperature range and then increases in the high temperature behaving like a reduced superconductive material. The IcRn product for the S-s’-S junction begins at 13.1 mV at 6 K while the IcRn product for the S-N-S junction begins at 1.9 mV at 8 K. The IcRn products decrease with temperature. The novelty of the work is that the paper shows the Rn and IcRn behavior of an S-s’-S and S-N-S type junctions fabricated strictly with the femtosecond laser. The paper also shows the Shapiro steps of the junctions. The optical equipment used to shape the laser beam have been described.
ISSN:29498228
DOI:10.1016/j.nxmate.2025.100635