Induced superconductivity in Kondo alloys

Journal Article · Mon Sep 01 04:00:00 EDT 1980 · Phys. Rev., B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.22.2323· OSTI ID:5132038

Kaiser, A B

The superconducting proximity effect between thin films of a superconductor and a Kondo alloy is analyzed theoretically, using the McMillan tunneling model to describe the proximity effect and the theory of Mueller-Hartmann and Zittartz to describe the effect of Kondo impurities on superconductivity. The calculations are compared to measurements of Dumoulin, Guyon, and Nedellec for CuCr-Pb and other similar systems. Comparison of the tunneling density of states confirms that the bound state moves up towards the band edge more quickly than predicted by the Mueller-Hartmann and Zittartz theory as the Kondo temperature increases. Fitting observed transition temperatures suggests the possibility of reentrant behavior at low temperatures. For both density of states and transition temperature, pair-breaking parameters approximately five times those expected theoretically are required to fit the data, possibly due to orbital degeneracy.

• Research Organization: Physics Department, Victoria University of Wellington, Wellington, New Zealand
• OSTI ID: 5132038
• Journal Information: Phys. Rev., B: Condens. Matter; (United States), Journal Name: Phys. Rev., B: Condens. Matter; (United States) Vol. 22:5; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ENERGY-LEVEL DENSITY
FILMS
KONDO EFFECT
PHYSICAL PROPERTIES
PROXIMITY EFFECT
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE