Superconductivity in 2D granular NbN
Conference
·
· AIP Conf. Proc.; (United States)
OSTI ID:5668502
The systematics of superconductivity in 2D granular NbN are reported as a function of variable intergranular coupling strength J/sub ggprime/. The characteris tics of the resistive transition, the critical currents and the dynamical I-V response are markedly altered by variations J/sub ggprime/. The results of this study are consistent with previous investigations of 2D granular NbN where three critical temperatures T/sub cg/ (superconducting transition of individual grains), T/sub cj/ (2D phase ordering transition) and T* (sudden increase in I/sub c/) were identified. As the coupling J/sub ggprime/ decreases, the critical fluctuation region above T/sub cj/ increases in magnitude and in temperature span. Similarly, the temperature T* moves to lower temperatures relative to T/sub cj/ as J/sub ggprime/ decreases. Examination of the I-V response curves revealed a hitherto unidentified characteristic temperature T/sub s/ which marks a change in the dynamic response of these 2D NbN films.
- Research Organization:
- Naval Research Laboratory, Washington, D.C. 20375
- OSTI ID:
- 5668502
- Report Number(s):
- CONF-791151-
- Conference Information:
- Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 58:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
GRAIN REFINEMENT
JOSEPHSON EFFECT
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TWO-DIMENSIONAL CALCULATIONS
VORTICES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
GRAIN REFINEMENT
JOSEPHSON EFFECT
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TWO-DIMENSIONAL CALCULATIONS
VORTICES