Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5492300 | Physica C: Superconductivity and its Applications | 2017 | 13 Pages |
Abstract
High temperature superconducting (HTS) nanostructure has a great potential in photon sensing at high frequency due to its fast recovery time. For maximising the coupling efficiency, the normal resistance of the nanostructure needs to be better matched to that of the thin-film antenna, which is typically few tens of ohm. We report on the fabrication of nanoscale high temperature superconducting YBa2Cu3O7âx (YBCO) constrictions using Gallium ion focus ion beam (FIB) technique. The FIB has been used to both remove the YBCO in lateral dimension and also tune its critical current and normal resistance by a combination of surface etching and implantation on the YBCO top layer. High critical current density of 2.5â¯MA/cm2 at 77â¯K can be obtained on YBCO nanobridges down to 100â¯nm in width. Subsequent trimming of the naobridges can lead to a normal resistance value over 50â¯Î©. Simulation of the Ga ion trajectory has also been performed to compare the measurement results. This method provides a simple step of fabricating nanoscale superconducting detectors such as hot electron bolometer.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Simon K.H. Lam, Avi Bendavid, Jia Du,