Strongly disordered TiN and NbTiN s-wave superconductors probed by microwave electrodynamics

Abstract

We probe the effects of strong disorder (2.4 < kFl < 8.6) on superconductivity in thin films of niobium titanium nitride and titanium nitride by measuring the microwave electrodynamics in coplanar waveguide resonators. We find a gradual evolution of the electromagnetic response with disorder, deviating from Mattis-Bardeen theory, for both materials. This result can be understood as due to changes in the quasiparticle density of states, induced by the short elastic scattering length. The observations are consistent with a model using an effective pair breaker, dependent on the level of disorder.

5+4 pages, 3 + 2 figures

References in corpus (6)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Localization of preformed Cooper-pairs in disordered superconductors
• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Phase fluctuations in a strongly disordered s-wave superconductor close to the metal-insulator transition
• Contribution of dielectrics to frequency and noise of NbTiN superconducting resonators
• Zero-bias conductance peak and Josephson effect in graphene-NbTiN junctions

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