Pair-breaking mechanisms in superconductor-normal metal-superconductor (SNS) junctions

Technical Report · Wed Jun 01 00:00:00 EDT 1983

OSTI ID:5994482

Yang, H C

Critical current density, J/sub c/, has been measured for high-quality Pb-Ag/sub 1-x-y/Mn/sub x/Al/sub y/-Pb junctions over a wide range of temperature and composition. The temperature dependence of J/sub c/ for samples containing magnetic impurities are found to follow a theory developed by Makeev et al. for a bridge geometry. This then implies that for the sandwich geometry, the modulus of the order parameter at the boundary is proportional to its bulk value in the superconductor as was assumed by Makeev et al. In this range, xi/sub s/ is essentially independent of T, so this is a reasonable result. As T approaches T/sub c/, J/sub c/ was found to be proportional to (I-T/T/sub c/)/sup 2/ as predicted. One junction which had a Mn concentration of about 0.5% and a spin glass temperature of 2.9K showed an inflection point in the J/sub c/1/2 vs. T data near 2.7K If data are taken in the presence of a constant magnetic field, then quantum oscillations are observed.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5994482
• Report Number(s): IS-T-1070; ON: DE83016414
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CURRENTS
ELEMENTS
IMPURITIES
JUNCTIONS
LEAD
MAGNETIC FIELDS
MANGANESE ALLOYS
METALS
ORDER PARAMETERS
OSCILLATIONS
SILVER ALLOYS
SUPERCONDUCTING JUNCTIONS
TEMPERATURE DEPENDENCE