Complete stabilization and improvement of the characteristics of tunnel junctions by thermal annealing

Abstract

We have observed that submicron sized Al--AlO{${}_x$}--Al tunnel junctions can be stabilized completely by annealing them in vacuum at temperatures between $350^{\circ }$C and $450^{\circ }$C. In addition, low temperature characterization of the samples after the annealing treatment showed a marked improvement of the tunneling characteristics due to disappearance of unwanted resonances in the current. Charging energy, tunneling resistance, barrier thickness and height all increase after the treatment. The superconducting gap is not affected, but supercurrent is reduced in accordance with the increase of tunneling resistance.

arXiv comment4 pages, 3 figures

References in corpus (9)

• Manipulating the Quantum State of an Electrical Circuit
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Opportunities for mesoscopics in thermometry and refrigeration: Physics and applications
• Demonstration of conditional gate operation using superconducting charge qubits
• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• Oxygen stoichiometry and instability in aluminium oxide tunnel barrier layers
• Aluminum Oxide Layers as Possible Components for Layered Tunnel Barriers
• Shot-noise-driven escape in hysteretic Josephson junctions
• The effect of thermal annealing on the properties of Al-AlOx-Al single electron tunneling transistors

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