Superconducting energy gap of niobium nitride
Journal Article
·
· Sov. Phys. - JETP (Engl. Transl.); (United States)
OSTI ID:5817878
The superconducting energy gap ..delta.. was measured by the electron tunneling method in niobium nitride having a columnar structure and a superconducting transition temperature T/sub c/ = 16.15 K. The values obtained, ..delta../sub 0/ = 2.46 meV and 2..delta../sub 0//kT/sub c/ = 3.53, are practically in agreement with the BCS theory. The temperature dependence of ..delta..(T) was measured in the temperature interval 2--6.5 K. It was found that the decrease of the gap with increasing temperature is faster than in accord with the BCS theory, but the vanishing of gap takes place at T = T/sub c/. The results are compared with earlier data obtained using worse samples. It turned out that with deteriorating sample quality the value of T/sub c/ decreases more rapidly than ..delta../sub 0/. The ratio 2..delta../sub 0//kT/sub c/ for poor samples can therefore reach 6.
- Research Organization:
- P. N. Lebedev Physics Institute, USSR Academy of Sciences and Moscow Institute of Steel and Alloys
- OSTI ID:
- 5817878
- Journal Information:
- Sov. Phys. - JETP (Engl. Transl.); (United States), Journal Name: Sov. Phys. - JETP (Engl. Transl.); (United States) Vol. 53:6; ISSN SPHJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BCS THEORY
CORRELATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
MEASURING METHODS
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT
ULTRALOW TEMPERATURE
360603* -- Materials-- Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BCS THEORY
CORRELATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
MEASURING METHODS
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT
ULTRALOW TEMPERATURE