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

Abstract

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.

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

References in corpus (6)

• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Eigenfunction fractality and pseudogap state near superconductor-insulator transition
• Superconducting properties and Hall Effect of epitaxial NbN thin films
• Phase fluctuations in a strongly disordered s-wave superconductor close to the metal-insulator transition
• Tunneling studies in a homogeneously disordered s-wave superconductor: NbN
• Temperature dependence of resistivity and Hall-coefficient in a strongly disordered metal: NbN

Cited by in corpus (10)

• Phase fluctuations in a strongly disordered s-wave superconductor close to the metal-insulator transition
• Frequency dependent superfluid stiffness in the pseudogap regime in strongly disordered NbN thin films
• Role of electronic correlations in the Kagome lattice superconductor LaRh${}_3$B${}_2$
• Slowing down of vortex motion in thin NbN films near the superconductor-insulator transition
• Evidence of the disorder-independent electron-phonon scattering time in thin NbN films
• Quantum phase transition in two-dimensional NbN superconducting thin films
• Investigation of the Pauli paramagnetic effect in systematically tuned NbN thin films
• Dynamic transition from Mott-like to metal-like state of the vortex lattice in a superconducting film with a periodic array of holes
• Tunneling study in granular aluminum near the Mott metal-to-insulator transition
• Andreev Reflections in NbN/graphene Junctions under Large Magnetic Fields