Measurement of Intrinsic Critical Currents of High-Temperature Superconducting Bicrystal Josephson Junctions

SUN Yong; XU Da; CHEN Qing; WANG Xueshen; LI Jinjin; ZHAO Jianting; ZHONG Qing

doi:10.3969/j.issn.1000-1158.2025.05.03

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Acta Metrologica Sinica ›› 2025, Vol. 46 ›› Issue (5) : 638-643. DOI: 10.3969/j.issn.1000-1158.2025.05.03

Measurement of Intrinsic Critical Currents of High-Temperature Superconducting Bicrystal Josephson Junctions

SUN Yong ¹^,² ,
XU Da ¹ ,
CHEN Qing ¹ ,
WANG Xueshen ¹ ,
LI Jinjin ¹ ,
ZHAO Jianting ¹ ,
ZHONG Qing ¹

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Abstract

The benefits of the high-temperature superconducting Josephson junction works in the liquid nitrogen temperature region， and has low cooling cost， so it can be applied to superconducting quantum interference devices， quantum voltage standard devices， etc. We fabricated yttrium-barium-copper-oxygen （YBCO） / gold （Au） bilayer film on SrTiO₃ bicrystal substrate， and prepared YBCO bicrystal Josephson junction by ultraviolet lithography and ion beam etching. The resistance-temperature （R-T） characteristic curves and voltage-current （V-I） characteristic curves of the YBCO bicrystal Josephson junction were measured in the liquid nitrogen temperature region. From the R-T curve， it was observed that the prepared YBCO bicrystal Josephson junction had obvious resistance tailing. The intrinsic critical current value of the high-temperature superconducting Josephson junction was obtained by using the geometric averaging method from selecting the appropriate data range and applying a hyperbolic function fitting method to eliminate the influence of noise rounding effect and self-heating effect on the critical current. After fitting the intrinsic critical current from the selected V-I data， noticeable noise rounding effects were observed in each YBCO bicrystal structure. Only the 2 μm-wide YBCO bicrystal structure showed significant susceptibility to self-heating effects， whereas the 4 μm， 6 μm， 8 μm， and 10 μm-wide YBCO bicrystal structures exhibited minor influence from self-heating effects.

Key words

electrical metrology / high-temperature-superconducting / intrinsic critical current / bicrystal Josephson junction / YBCO

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SUN Yong , XU Da , CHEN Qing , et al . Measurement of Intrinsic Critical Currents of High-Temperature Superconducting Bicrystal Josephson Junctions[J]. Acta Metrologica Sinica. 2025, 46(5): 638-643 https://doi.org/10.3969/j.issn.1000-1158.2025.05.03

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