Quantum phenomena in mesoscopic superconducting tunnel junctions. Technical report

Technical Report · Thu Dec 01 00:00:00 EST 1988

OSTI ID:6159194

Iansiti, M

A low-temperature study of very small superconducting tunnel junctions is reported. The samples were fabricated by using electron-beam lithography and thermal evaporation in single-junction, double-junction and eleven-junction-array configurations. The junctions had normal resistances between 0.5 and 140 kilo-ohms and areas between 0.1 and 0.02 sq micrometer. Current-voltage characteristics of the devices were measured at low temperatures (20 mk - 4 K), using a dilution refrigerator. In general, the devices had a large single-electron charging energy E(c) identical to sq e /2c of order 1 K. By varying the ratio of Ec to the Josephson coupling energy E(j), the crossover the studied between the conventional Josephson regime, in which E(j)>>E(c), and the Coulomb blockade regime, in which charging effects are dominant. For comparable charging and Josephson energies, the I-V curve is resistive at all currents, and exhibits a novel low-voltage resistance R(o) at currents less than the critical current Ic.

• Research Organization: Harvard Univ., Cambridge, MA (USA). Div. of Applied Sciences
• OSTI ID: 6159194
• Report Number(s): AD-A-203354/6/XAB; TR-27
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SUPERCONDUCTING JUNCTIONS
ELECTRICAL PROPERTIES
CURRENTS
DILUTION
ELECTRON BEAMS
EVAPORATION
HEAT
PROGRESS REPORT
SUPERCONDUCTORS
ULTRALOW TEMPERATURE
BEAMS
DOCUMENT TYPES
ENERGY
JUNCTIONS
LEPTON BEAMS
PARTICLE BEAMS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
420201* - Engineering- Cryogenic Equipment & Devices