YBa2Cu3O7−δ superconducting quantum interference devices with metallic to insulating barriers written with a focused helium ion beam
Abstract
In this work, we demonstrate the ability to fabricate superconducting quantum interference devices (SQUIDs) by directly writing Josephson junctions into the plane of YBa2Cu3O7−δ thin films with a focused helium ion beam. This technique allows for the control of the Josephson barrier transport properties through the single parameter, ion dose. SQUIDs written with a dose of 4 × 1016 ions/cm2 had metallic barrier junctions that exhibited nearly ideal electrical transport characteristics at 50 K and a flux noise of 20 μΦ0/Hz at 10 Hz. At higher irradiation doses, the SQUIDs had insulating barrier Josephson junctions with a quasi particle energy gap edge at 20 meV.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 22, 2015
- Source ID
- 10.1063/1.4922640
Entities
People
- Chuong Huynh
- D. N. Paulson
- E. Y. Cho
- K. Pratt
- M. K. Ma
- R C Dynes
- Shane A Cybart
- V. N. Glyantsev
Organizations
- Air Force Office of Scientific Research
- University of California, San Diego