High frequency behavior of long and small junctions. Final report, 1 December 1988-30 November 1992

Technical Report · Thu May 06 04:00:00 EDT 1993

OSTI ID:6456504

Symko, O G

This research consisted of studies of the fundamentals and applications of long Josephson Junctions and very small junctions, all fabricated out of NbN. Technology has been developed for fabricating by reactive sputtering high quality long Josephson junctions with current densities of 100-1,000 A/sq cm. Such junctions were used for studies of giant steps on the I-V curve caused by fluxon pinning and of macroscopic quantum tunneling down to 15 mK. A new system, a long Josephson junction biased at Fiske steps, is presented for studies of Macroscopic Quantum Tunneling. The results show applications of fluxons in long Josephson junctions for Fluxon Oscillators, Voltage Standards, and for observing Macroscopic Coherent Tunneling. The authors have also studied very small NbN junctions fabricated with a STM where single electron tunneling is observed. The authors were the first to present such tunneling at room temperature; this is important for applications. Students and postdoctoral fellows were involved in this research.

• Research Organization: Utah Univ., Salt Lake City, UT (United States). Dept. of Physics
• OSTI ID: 6456504
• Report Number(s): AD-A-265670/0/XAB; CNN: AFOSR-89-0149
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426000* -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
665400 -- Quantum Physics Aspects of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMBIENT TEMPERATURE
DATA
EXPERIMENTAL DATA
FABRICATION
INFORMATION
JOSEPHSON JUNCTIONS
JUNCTIONS
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
PNICTIDES
QUANTUM ELECTRONICS
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENT COMPOUNDS
USES