Superconductor-Insulator Transitions in Pure Polycrystalline Nb Thin Films

F. Couëdo (1) , O. Crauste (1) , L. Berge (2) , Y. Dolgorouky (1) , C. Marrache (1) , L. Dumoulin (1)

1 CSNSM PS1
2 CSNSM INSTR

We report on a study of the transport properties of Nb thin films. By varying the thickness of the films from 263 angstrom to 25 angstrom, 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.

Domaines: Supraconductivité [cond-mat.supr-con]

F. Couëdo, O. Crauste, L. Berge, Y. Dolgorouky, C. Marrache, et al.. Superconductor-Insulator Transitions in Pure Polycrystalline Nb Thin Films. 26th International conference on low temperature physics (LT26), 2011, Beijin, China. pp.022011, ⟨10.1088/1742-6596/400/2/022011⟩. ⟨in2p3-00824879⟩