Superconductor—Insulator Transitions in Pure Polycrystalline Nb Thin Films

We report on a study of the transport properties of Nb thin films. By varying the thickness of the films from 263 Å to 25 Å, we observed a depression of the superconductivity. Magnetic field was also applied up to 6 T, inducing the disappearance of the superconductivity and the onset of an insulatin...

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Published inJournal of physics. Conference series Vol. 400; no. 2; pp. 22011 - 5
Main Authors Couedo, F, Crauste, O, Bergé, L, Dolgorouky, Y, Marrache-Kikuchi, C, Dumoulin, L
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.01.2012
Subjects
Depression
Magnetic fields
Niobium
Physics
Superconductivity
Thickness
Thin films
Transport properties
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Summary:We report on a study of the transport properties of Nb thin films. By varying the thickness of the films from 263 Å to 25 Å, we observed a depression of the superconductivity. Magnetic field was also applied up to 6 T, inducing the disappearance of the superconductivity and the onset of an insulating behavior. The results were compared to those we have already obtained on a highly disordered system, a-NbxSi1−x, to understand whether the same mechanisms for the disappearance of the superconductivity could be at play in pure metallic thin films and in highly disordered systems.
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ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/400/2/022011