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Fabrication and Properties of High- T_{\rm c} YBCO Josephson Junction and SQUID With Variable Thickness Bridges by Focused Ion Beam

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6 Author(s)
Chiu-Hsien Wu ; Inst. of Nanosci., Nat. Chung Hsing Univ., Taichung, Taiwan ; Fong-Jyun Jhan ; Jau-Han Chen ; Jen-Tzong Jeng
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We have successfully fabricated YBCO Josephson junctions and SQUIDs with variable thickness bridges. The variable-thickness bridges of YBCO thin film were fabricated by photolithography and Focused ion beam mill. The Josephson effects of variable thickness bridges were obtained in a 80 nm-thick-film of high-Tc YBa2Cu3Oy. The Shapiro steps were observed in single junction in the gigahertz range from 3.02 to 14.64 GHz. The voltage-current and voltage-field characteristics were measured in SQUID magnetometer. The SQUID shows a peak-to-peak voltage swing of 1.5 μV at 70 K. The properties of one junction and SQUID magnetometer have been investigated.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:21 ,  Issue: 3 )

Date of Publication:

June 2011

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