Proximity-induced Josephson effect and its application to heavy-fermion superconductor UBe/sub 13/
A new effect between a superconductor with superconducting transition temperature T/sub CS/ and a normal metal N(T/sub cn/) (or another superconductor with T/sub cn/ < T/sub cs/) was experimentally observed and theoretically explained. That is, when S and N are brought together to form a weak link, the Josephson effect can occur in this SN system even in the temperature range T/sub cn/ < T < T/sub cs/, when the N side is in the normal state. This Josephson effect is believed to happen between the S and a region of proximity-induced super-conductivity in N near the contact with S. This is called the proximity-induced Josephson effect. The temperature dependence of the Josephson critical current I/sub c/(T) of the SN point-contact junctions have been studied experimentally. The experiments were performed on Ta/Mo, Ta/UBe/sub 13/, and Nb/Ta point contact, etc. The theoretical model is based on the linearized Gor'kov equation (or linearized Ginzburg-Landau equation) combined with de Gennes boundary conditions. Along with the recent discovery of the superconductivity in heavy-fermion materials CeCu/sub 2/Si/sub 2/, UBe/sub 13/, and UPt/sub 3/, the old question of p-wave pairing superconductivity is raised again (in case of the existence of strong spin-orbit scattering, it should be called odd-parity superconductivity, since in that case the wave function of Cooper pairs cannot be separated into spin part and orbit part).
- Research Organization:
- Iowa State Univ. of Science and Technology, Ames (USA)
- OSTI ID:
- 7079343
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTINIDE ALLOYS
ALLOYS
BERYLLIUM ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRIC CONTACTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
JOSEPHSON EFFECT
METALS
NIOBIUM
PHYSICAL PROPERTIES
PROXIMITY EFFECT
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TANTALUM
TRANSITION ELEMENTS
URANIUM ALLOYS