Fluxons and order in long Josephson junctions. Final report, 15 November 1985-14 November 1988

Technical Report · Thu Feb 23 23:00:00 EST 1989

OSTI ID:5636727

Symko, O G

Studies were made of fluxon dynamics, instabilities, and noise in long overlap-type Josephson junctions made out of of niobium-nitride and niobium. Noise and fluctuations measurements were performed in the voltage state of the junctions biased in a magnetic field. Telegraph noise was observed due to fluxon fluctuations between two energy states determined by the geometry of the junction and the external magnetic field bias. The studies covered lifetimes of these states, metastability, thermal and quantum mechanical tunneling, and effects of dissipation. At certain bias points of the junction chaotic behavior was found< which was preceded by period-doubling bifurcation. Also negative resistance regions were observed; they can be used for amplification. These observations were supported by computer modeling using a perturbed sine-Gordon equation. Fluxon motion in long Josephson junctions provides an excellent system for studies of nonlinear phenomena and it has a variety of applications to superconducting electronics.

• Research Organization: Utah Univ., Salt Lake City, UT (USA). Dept. of Physics
• OSTI ID: 5636727
• Report Number(s): AD-A-207925/9/XAB
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment &amp; Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPUTERIZED SIMULATION
DOCUMENT TYPES
DYNAMICS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EQUATIONS
FIELD EQUATIONS
JOSEPHSON JUNCTIONS
JUNCTIONS
MAGNETIC FIELDS
MECHANICAL PROPERTIES
MECHANICS
METALS
NIOBIUM
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
NONLINEAR PROBLEMS
PHYSICAL PROPERTIES
PNICTIDES
PROGRESS REPORT
QUANTUM ELECTRONICS
REFRACTORY METAL COMPOUNDS
SIMULATION
SINE-GORDON EQUATION
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS