Phase diagram and upper critical field of homogenously disordered epitaxial 3-dimensional NbN films

Details Phase diagram and upper critical field of homogenously disordered epitaxial 3-dimensional NbN films Phase diagram and upper critical field of homogenously disordered epitaxial 3-dimensional NbN films

2010-05-10

arxiv.org/abs/1005.1628v3

J. Supercond. Nov. Magn. 24, 341 (2011)

Physics

Condensed Matter

Superconductivity

To appear in Journal of Superconductivity and Novel Magnetism (ICSM2010 proceedings)

Scientific paper

10.1007/s10948-010-1038-8

We report the evolution of superconducting properties with disorder, in 3-dimensional homogeneously disordered epitaxial NbN thin films. The effective disorder in NbN is controlled from moderately clean limit down to Anderson metal-insulator transition by changing the deposition conditions. We propose a phase diagram for NbN in temperature-disorder plane. With increasing disorder we observe that as kFl-->1 the superconducting transition temperature (Tc) and minimum conductivity (sigma_0) go to zero. The phase diagram shows that in homogeneously disordered 3-D NbN films, the metal-insulator transition and the superconductor-insulator transition occur at a single quantum critical point at kFl~1.

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