DC and AC Josephson effects observed in high-temperature superconductor YBaCuO

Journal Article · Sun Nov 01 04:00:00 EST 1987 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00682664· OSTI ID:5894103

Kuznik, J; Odehnal, M; Safrata, S; Endal, J

The authors report the observation of the dc and ac Josephson effect and quasiparticle tunneling in the high-temperature superconductor YBaCuO. The observation is made at 4.2 K. These effects were observed in a junction made by a niobium tip pressed against a high-T/sub c/ sample of YBaCuO ceramic. The authors observed a clean dc Josephson effect with a critical current I/sub c/ approx. 2 ..mu..A and the ac effect with Shapiro steps corresponding to V = (hf/2e)n. The nature of the junction is not clear; however, the authors suggest that all observed effects can be explained by assuming a singlet pairing state in the ceramic. The authors have also observed a very peculiar noise behavior along the V-I characteristic.

• Research Organization: Institute of Physics, Rez, Czechoslovakia
• OSTI ID: 5894103
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 69:3-4; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALTERNATING CURRENT
BARIUM COMPOUNDS
BARIUM OXIDES
CERAMICS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
DIRECT CURRENT
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
JUNCTIONS
METALS
NIOBIUM
NOISE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUASI PARTICLES
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
TUNNEL EFFECT
ULTRALOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES