Riedel singularity in tin--tin oxide--tin tunnel junctions

Journal Article · Mon Mar 01 04:00:00 EST 1976 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00659061· OSTI ID:7152896

Buckner, S A; Langenberg, D N

The Riedel peak in the Josephson supercurrent in Sn--Sn oxide--Sn tunnel junctions has been investigated by studying the amplitudes of microwave-induced steps. At low temperatures, the peak rises to a value approximately 2.8 times the zero-voltage supercurrent amplitude. This can be accounted for quantitatively in terms of the known bulk gap anisotropy of tin, reduced by a factor of 2 to 3 due to dirty-superconductor averaging and a further factor of about 17 due to preferred crystallographic orientation of the films comprising the junctions. At high temperatures, the truncation of the peak is in quantitative agreement with theoretical predictions of the effect of quasiparticle damping processes. Complementary measurements of the slope of the quasiparticle tunnel current at the gap voltage cannot be satisfactorily explained in a similar way, despite the common origin of the quasiparticle current jump at the gap voltage and the Riedel peak in the quasiparticle density-of-states peak at the gap edge. The quasiparticle current jump appears to be broadened by some mechanism which does not significantly affect the Riedel peak.

• Research Organization: Univ. of Pennsylvania, Philadelphia
• OSTI ID: 7152896
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 22:5/6; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
CHALCOGENIDES
CRYSTAL STRUCTURE
DAMPING
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY GAP
FILMS
GRAIN ORIENTATION
JOSEPHSON EFFECT
JUNCTIONS
METALS
MICROSTRUCTURE
MICROWAVE RADIATION
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
QUASI PARTICLES
RADIATIONS
SINGULARITY
SUPERCONDUCTING FILMS
TIN
TIN COMPOUNDS
TIN OXIDES
TUNNEL EFFECT
ULTRALOW TEMPERATURE