Measurement of the pair potential in aligned Pb-Cd lamellar eutectic composites
Thermal-conductivity measurements have been used to study the pair potential in multilayer superconductor--normal-metal lamellar composites. Lamellar Pb-Cd eutectic samples were prepared by a high-speed directional solidification technique which generates large single-grain samples with all the lamellae lined up in the same direction. For thin Cd layers where the pair potential ..delta.. is expected to be uniform throughout the Cd, the pair potential is found to be approx. 40% of the value in bulk Pb. This gives direct experimental evidence that the boundary condition requiring continuity of ..delta../NV applies in the clean regime. Surprisingly, the electron mean free path in the Cd is longer than the width of the lamellae implying that Andreev scattering is suppressed at the Pb-Cd interface.
- Research Organization:
- Ames Laboratory-U.S. Department of Energy, Iowa State University, Ames, Iowa 50011
- OSTI ID:
- 6581681
- Journal Information:
- Phys. Rev., B: Solid State; (United States), Journal Name: Phys. Rev., B: Solid State; (United States) Vol. 18:7; ISSN PLRBA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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
CADMIUM ALLOYS
COMPOSITE MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRIC POTENTIAL
ELECTRICAL PROPERTIES
LAMELLAE
LEAD ALLOYS
PHYSICAL PROPERTIES
PROXIMITY EFFECT
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTIVITY
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES