High-Quality Planar high-Tc Josephson Junctions

Details High-Quality Planar high-Tc Josephson Junctions High-Quality Planar high-Tc Josephson Junctions

2005-06-30

arxiv.org/abs/cond-mat/0506792v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures, to be published in Applied Physics Letters

Scientific paper

10.1063/1.2037206

Reproducible high-Tc Josephson junctions have been made in a rather simple two-step process using ion irradiation. A microbridge (1 to 5 ?m wide) is firstly designed by ion irradiating a c-axis-oriented YBa2Cu3O7-? film through a gold mask such as the non-protected part becomes insulating. A lower Tc part is then defined within the bridge by irradiating with a much lower fluence through a narrow slit (20 nm) opened in a standard electronic photoresist. These planar junctions, whose settings can be finely tuned, exhibit reproducible and nearly ideal Josephson characteristics. This process can be used to produce complex Josephson circuits.

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