Surface-impedance measurements of superconducting NbN films
Technical Report
·
OSTI ID:5052776
The temperature and frequency dependences of the surface impedance of NbN thin films have been measured from 4.2 to 13 K and from 0.5 to 10 GHz using a stripline resonator. At 4.2 K resonant-cavity measurements of surface resistance were made at 35 and at 56 GHz. From surface reactance measurements using both cavity and stripline techniques, The authors obtain the penetration depth extrapolated to 0 K, gamma(0)=3700 {angstrom}. For the stripline, the film thickness was approximately 8000 {angstrom}, which is about two times the measured penetration depth. The weak-coupling Mattis-Bardeen theory was used to fit the temperature dependence of the surface resistance. Based on the quality of the weak-coupling fit to the data, they conclude that the strong-coupling effect is not important in the local and dirty limits. They discuss the correction due to the finite film thickness of the stripline measurements of the surface resistance.
- Research Organization:
- Massachusetts Inst. of Tech., Lexington, MA (United States). Lincoln Lab.
- OSTI ID:
- 5052776
- Report Number(s):
- AD-A-235632/7/XAB; JA--6560; CNN: F19628-90-C-0002
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUIPMENT
FILMS
FREQUENCY DEPENDENCE
IMPEDANCE
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PENETRATION DEPTH
PHYSICAL PROPERTIES
PNICTIDES
REFRACTORY METAL COMPOUNDS
RESONATORS
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SURFACE PROPERTIES
SURFACES
TEMPERATURE DEPENDENCE
THICKNESS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUIPMENT
FILMS
FREQUENCY DEPENDENCE
IMPEDANCE
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PENETRATION DEPTH
PHYSICAL PROPERTIES
PNICTIDES
REFRACTORY METAL COMPOUNDS
RESONATORS
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SURFACE PROPERTIES
SURFACES
TEMPERATURE DEPENDENCE
THICKNESS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE