Self-positioned thin Pb-alloy base electrode Josephson junction

Journal Article · Sat Nov 01 04:00:00 EST 1986 · J. Vac. Sci. Technol., A; (United States)

DOI:https://doi.org/10.1116/1.573719· OSTI ID:6994208

Kuroda, K; Sato, K

A self-positioned thin (SPOT) Pb-alloy base electrode Josephson junction is developed. In this junction, a 50-nm thick Pb-alloy base electrode is restricted within the junction region on an Nb underlayer using a self-alignment technique. The grain size reduction and the base electrode area restriction greatly improve thermal cycling stability, where the thermal cycling tests of 4000 proposed junctions (5 x 5 ..mu..m/sup 2/) showed no failures after 4000 cycles. In addition, the elimination of insulator layer stress on the Pb-alloy base electrode rectifies the problem of size effect on current density. The Nb underlayers also serve to isolate the Pb-alloy base electrodes from the resistors.

• Research Organization: NTT Electrical Communications Laboratories, Morinosato Wakamiya 3-1, Atsugi-shi, Kanagawa, 243-01, Japan
• OSTI ID: 6994208
• Journal Information: J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 4:6; ISSN JVTAD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
CRYSTAL STRUCTURE
ELECTRICAL PROPERTIES
ELECTRODES
ELEMENTS
FABRICATION
FAILURES
GRAIN SIZE
JOSEPHSON JUNCTIONS
JUNCTIONS
LEAD ALLOYS
METALS
MICROSTRUCTURE
NIOBIUM
PHYSICAL PROPERTIES
SIZE
SUPERCONDUCTING JUNCTIONS
THERMAL CYCLING
TRANSITION ELEMENTS