Anupama Bhat et al 1999 Supercond. Sci. Technol. 12 1030 doi:10.1088/0953-2048/12/11/401
Anupama Bhat, Xiaofan Meng, Andre Wong and Theodore Van Duzer
Show affiliationsWe have grown superconducting NbN films using a pulsed KrF laser for potential use as superconducting electrodes in SNS Josephson junctions being developed for nonlatching logic applications. The NbN films show a superconducting transition of 16 K using an Nb target in background N2 gas. The Tc dependence on N2 pressure in the range of 50-80 mTorr was investigated at a growth temperature of 600 °C. The NbN films were grown on MgO(100) and amorphous SiNx/Si substrates. In the latter case, the films had a lower Tc, and appeared amorphous from xray diffraction measurements, while those on the MgO(100) substrates were strongly textured. AFM measurements reveal RMS surface roughness as low as 1 nm, over a 5 µm × 5 µm area, indicating that these films appear suitable for SNS junctions.
74.45.+c Proximity effects; Andreev effect; SN and SNS junctions
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
Issue 11 (November 1999)
Received 22 June 1999
Anupama Bhat et al 1999 Supercond. Sci. Technol. 12 1030
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