High-Quality Planar high-Tc Josephson Junctions

Abstract

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.

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

References in corpus (1)

• Linear Temperature Variation of the Penetration Depth in YBCO Thin Films

Cited by in corpus (16)

• Josephson junctions and SQUIDs created by focused helium ion beam irradiation of YBa${}_2$Cu${}_3$O${}_7$
• High-Tc Superconducting Quantum Interference Filters (SQIFs) made by ion irradiation
• High-Tc superconducting detector for highly-sensitive microwave magnetometry
• Dynamic properties of high-Tc superconducting nano-junctions made with a focused helium ion beam
• Hysteretic vortex matching effects in high-$T_c$ superconductors with nanoscale periodic pinning landscapes fabricated by He ion beam projection technique
• Static and Radio-frequency magnetic response of high Tc Superconducting Quantum Interference Filters made by ion irradiation
• Nano-patterning of cuprate superconductors by masked He${}^{+}$ ion irradiation: 3-dimensional profiles of the local critical temperature
• A high-temperature superconducting weak-link defined by ferroelectric field-effect
• High Tc Josephson nanoJunctions made by ion irradiation : characteristics and reproducibility
• Study and optimization of ion-irradiated High-Tc Josephson nanoJunctions by Monte Carlo simulations
• Josephson oscillation linewidth of ion-irradiated YBa${}_2$Cu${}_3$O${}_7$ junctions
• Imprinting nanoporous alumina patterns into the magneto-transport of oxide superconductors
• Improving HTc Josephson Junctions (HTc JJ) by annealing: the role of vacancy-interstitial annihilation
• Josephson coupling in Lanthanum-based cuprates superlattices
• Nanostructured Superconductors
• Temporal Evolution of Defects and Related Electric Properties in He-Irradiated YBa${}_2$Cu${}_3$O${}_{7-\delta }$ Thin Films