Superconducting properties of B1 nitrides film obtained by gas-metal reaction for RF application

The authors investigated the RF behavior of the B1-type superconductors NbN obtained by reacting reactor-grade niobium samples in high-purity (10 p.p.m. of total impurities) nitrogen atmosphere after a baking at high temperature (800 degrees C) in an UHV furnace. They obtained a critical temperature...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1989-03, Vol.25 (2), p.1865-1867
Main Authors: Fabbricatore, P., Fernandes, P., Gualco, G.C., Musenich, R., Parodi, R.
Format: Article
Language:English
Subjects:
Atmosphere
Furnaces
High temperature superconductors
Impurities
Lattices
Niobium
Nitrogen
Radio frequency
Superconducting films
Surface resistance
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Summary:The authors investigated the RF behavior of the B1-type superconductors NbN obtained by reacting reactor-grade niobium samples in high-purity (10 p.p.m. of total impurities) nitrogen atmosphere after a baking at high temperature (800 degrees C) in an UHV furnace. They obtained a critical temperature of 14.6 K for a tetragonally distorted cubic lattice with cell parameters a=4.381 AA and c=4.324 AA, as determined by X-ray diffraction. The RF test showed for the resonator, operating at 4.5 GHz, a surface resistance at 4.2 K of 1 mu Omega in good agreement with the value predicted by the BCS theory.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.92668