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- W2110368341 abstract "Reproducible High T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> Josephson junctions have been made in a rather simple two-step process using ion irradiation. A microbridge 1 to 5 mum wide is firstly designed by ion irradiating a c-axis-oriented YBa <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> Cu <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> O <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>7</sub> film through a gold mask such as the unprotected part becomes insulating. A lower T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> part is then defined within the bridge by irradiating with a much lower dose through a 20 nm wide narrow slit opened in a standard electronic photoresist. These planar junctions, whose settings can be finely tuned, exhibit reproducible and nearly ideal Josephson characteristics. Non hysteretic resistively shunted junction (RSJ) like behavior is observed, together with sine Fraunhofer patterns for rectangular junctions. The I <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>C</sub> R <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>n</sub> product varies with temperature; it can reach a few mV. The typical resistance ranges from 0.1 to a few ohms, and the critical current density can be as high as 30 kA/cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> . The spread in characteristics is very low, in the 5% to 10% range. Such nanojunctions have been used to make microSQUIDs (superconducting quantum interference device) operating at liquid nitrogen (LN <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> ) temperature. They exhibit a very small asymmetry, a good sensitivity and a rather low noise. The process is easily scalable to make complex Josephson circuits." @default.
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- W2110368341 date "2007-06-01" @default.
- W2110368341 modified "2023-10-17" @default.
- W2110368341 title "High Tc Josephson Nanojunctions Made by Ion Irradiation: Characteristics and Reproducibility" @default.
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- W2110368341 doi "https://doi.org/10.1109/tasc.2007.898058" @default.
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