Infrared Pulsed Laser Deposition of Niobium Nitride Thin Films

Author

Chaudhuri, Saumyadip S. ; Nevala, Minna R. ; Hakkarainen, Teemu ; Niemi, Tapio K. ; Maasilta, Ilari J.

Author_Institution

Dept. of Phys., Univ. of Jyvaskyla, Jyväskyla, Finland

Volume

21

Issue

3

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

143

Lastpage

146

Abstract

We have successfully fabricated superconducting niobium nitride thin films on single crystals of magnesium oxide using a pulsed laser deposition technique where 1064 nm (photon energy ~1.16 eV) laser pulses from an Nd:YAG laser were used for ablation. A correlation between the superconducting transition temperature, the nitrogen base pressure during deposition and the lattice parameter of the produced NbN films was observed. Superconductor-insulator-normal metal junctions fabricated using these NbN films as the superconductor revealed nonlinear electrical characteristics at 4.2 K associated with quasiparticle tunneling.

Keywords

electronic density of states; high-temperature superconductors; lattice constants; niobium compounds; pulsed laser deposition; quasiparticles; superconducting thin films; superconducting transition temperature; superconductive tunnelling; superconductor-normal-superconductor devices; MgO; NbN; Nd:YAG laser; ablation; electronic density-of-states; infrared pulsed laser deposition; lattice parameter; magnesium oxide single crystals; nitrogen base pressure; nonlinear electrical characteristics; photon energy; quasiparticle tunneling; superconducting niobium nitride thin films; superconducting transition temperature; superconductor-insulator-normal metal junctions; temperature 4.2 K; Crystals; Josephson junctions; Junctions; Laser ablation; Pulsed laser deposition; Semiconductor lasers; Superconducting photodetectors; Pulsed laser deposition; superconductivity; thin films; tunnel junctions;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2010.2081656

Filename

5617300