Strongly Disordered TiN and NbTiN s-Wave Superconductors Probed by Microwave Electrodynamics

E. F. C. Driessen, P. C. J. J. Coumou, R. R. Tromp, P. J. de Visser, and T. M. Klapwijk
Phys. Rev. Lett. 109, 107003 – Published 7 September 2012
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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 BCS 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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  • Received 8 May 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.107003

© 2012 American Physical Society

Authors & Affiliations

E. F. C. Driessen1,*, P. C. J. J. Coumou1, R. R. Tromp1, P. J. de Visser1,2, and T. M. Klapwijk1

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
  • 2SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands

  • *e.f.c.driessen@tudelft.nl

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Vol. 109, Iss. 10 — 7 September 2012

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