The S-s’-S and S-N-S type superconductive junctions on YBCO material
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 siz...
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
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| Series: | Next Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949822825001534 |
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| Summary: | 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. |
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| ISSN: | 2949-8228 |