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RESEARCH PRODUCT

Infrared pulsed laser deposition of niobium nitride thin films

M. R. NevalaTapio NiemiIlari MaasiltaS. ChaudhuriTeemu Hakkarainen

subject

Materials scienceNiobium nitrideLaser ablationCondensed matter physicsta114business.industryFar-infrared laserPhysics::OpticsCondensed Matter PhysicsLaserElectronic Optical and Magnetic MaterialsPulsed laser depositionlaw.inventionSemiconductor laser theoryCondensed Matter::Materials Sciencechemistry.chemical_compoundchemistrylawCondensed Matter::SuperconductivityNd:YAG laserOptoelectronicsElectrical and Electronic EngineeringThin filmbusinessta216

description

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.

yearjournalcountryeditionlanguage
2011-06-01IEEE Transactions on Applied Superconductivity
10.1109/tasc.2010.2081656https://doi.org/10.1109/TASC.2010.2081656