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Strongly Disordered TiN and NbTiNs-Wave Superconductors Probed by Microwave Electrodynamics

Driessen, E. F. C. and Coumou, P. C. J. J. and Tromp, R. R. and de Visser, P. J. and Klapwijk, T. M. (2012) Strongly Disordered TiN and NbTiNs-Wave Superconductors Probed by Microwave Electrodynamics. Physical Review Letters, 109 (10). Art No. , 107003. ISSN 0031-9007. doi:10.1103/PhysRevLett.109.107003.

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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 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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Additional Information:Copyright 2012 American Physical Society. Received 8 May 2012; published 7 September 2012. The authors thank Nathan Vercruyssen, Misha Feigel’man, Misha Skvortsov, and Jochem Baselmans for helpful discussions, and Marc Zuiddam and Tony Zijlstra for help in depositing the various thin films. T. M. K. thanks the Keck Institute for Space Studies for supporting his stay at the California Institute of Technology, which helped to initiate this work. The research was financially supported by MicroKelvin (Grant No. 228464, Capacities Specific Programme) and the Dutch Foundation for Research of Matter (FOM).
Group:Keck Institute for Space Studies
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Keck Institute for Space Studies (KISS)UNSPECIFIED
Dutch Foundation for Fundamental Research on Matter (FOM)UNSPECIFIED
Issue or Number:10
Record Number:CaltechAUTHORS:20160310-161220209
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65281
Deposited By: Colette Connor
Deposited On:11 Mar 2016 00:46
Last Modified:10 Nov 2021 23:42

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