Title :
Superconducting properties of B1 nitrides film obtained by gas-metal reaction for RF application
Author :
Fabbricatore, P. ; Fernandes, P. ; Gualco, G.C. ; Musenich, R. ; Parodi, R.
Author_Institution :
INFN, Genoa, Italy
fDate :
3/1/1989 12:00:00 AM
Abstract :
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°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 Å and c =4.324 Å, 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 μΩ in good agreement with the value predicted by the BCS theory
Keywords :
X-ray diffraction examination of materials; cavity resonators; lattice constants; niobium compounds; superconducting thin films; superconducting transition temperature; surface conductivity; type II superconductors; 1 muohm; 14.6 K; 4.2 K; 4.5 GHz; 800 degC; B1 nitrides; BCS theory; NbN; RF application; X-ray diffraction; baking; cell parameters; critical temperature; gas-metal reaction; resonator; surface resistance; tetragonally distorted cubic lattice; Atmosphere; Furnaces; High temperature superconductors; Impurities; Lattices; Niobium; Nitrogen; Radio frequency; Superconducting films; Surface resistance;
Journal_Title :
Magnetics, IEEE Transactions on
