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

E. F. C. Driessen; P. C. J. J. Coumou; P. J. de Visser; R. R. Tromp; T. M. Klapwijk

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

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arxiv 1205.2463 v2 pith:L3GYSZMH submitted 2012-05-11 cond-mat.supr-con

E. F. C. Driessen , P. C. J. J. Coumou , R. R. Tromp , P. J. de Visser , T. M. Klapwijk This is my paper

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keywords disorderelectrodynamicsmicrowavenitridetitaniumbreakerchangesconsistent

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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.

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