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Phase fluctuations in a strongly disordered s-wave NbN superconductor close to the metal-insulator transition
Mintu Mondal1, Anand Kamlapure, Madhavi Chand
1Tata Institute of Fundamental Research, Mumbai, India.
Abstract:
We explore the role of phase fluctuations in a three-dimensional s-wave superconductor, NbN, as we approach the critical disorder for destruction of the superconducting state. Close to critical disorder, we observe a finite gap in the electronic spectrum which persists at temperatures well above T(c). The superfluid density is strongly suppressed at low temperatures and evolves towards a linear-T variation at higher temperatures. These observations provide strong evidence that phase fluctuations play a central role in the formation of a pseudogap state in a disordered s-wave superconductor.
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