Enhancement of the finite-frequency superfluid response in the pseudogap regime of strongly disordered superconducting films (Articolo in rivista)

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  • Enhancement of the finite-frequency superfluid response in the pseudogap regime of strongly disordered superconducting films (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1038/srep01357 (literal)
Alternative label
  • Mintu Mondal (1); Anand Kamlapure (1); Somesh Chandra Ganguli (1); John Jesudasan (1); Vivas Bagwe (1); Lara Benfatto (2); Pratap Raychaudhuri (1) (2013)
    Enhancement of the finite-frequency superfluid response in the pseudogap regime of strongly disordered superconducting films
    in Scientific reports (Nature Publishing Group)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Mintu Mondal (1); Anand Kamlapure (1); Somesh Chandra Ganguli (1); John Jesudasan (1); Vivas Bagwe (1); Lara Benfatto (2); Pratap Raychaudhuri (1) (literal)
Pagina inizio
  • 1357 (literal)
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  • http://www.nature.com/srep/2013/130228/srep01357/full/srep01357.html (literal)
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  • 3 (literal)
Rivista
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  • 6 (literal)
Note
  • Scopu (literal)
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  • (1) Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India (2) ISC-CNR and Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy (literal)
Titolo
  • Enhancement of the finite-frequency superfluid response in the pseudogap regime of strongly disordered superconducting films (literal)
Abstract
  • The persistence of a soft gap in the density of states above the superconducting transition temperature T c, the pseudogap, has long been thought to be a hallmark of unconventional high-temperature superconductors. However, in the last few years this paradigm has been strongly revised by increasing experimental evidence for the emergence of a pseudogap state in strongly-disordered conventional superconductors. Nonetheless, the nature of this state, probed primarily through scanning tunneling spectroscopy (STS) measurements, remains partly elusive. Here we show that the dynamic response above T c, obtained from the complex ac conductivity, is highly modified in the pseudogap regime of strongly disordered NbN films. Below the pseudogap temperature, T*, the superfluid stiffness acquires a strong frequency dependence associated with a marked slowing down of critical fluctuations. When translated into the length-scale of fluctuations, our results suggest a scenario of thermal phase fluctuations between superconducting domains in a strongly disordered s-wave superconductor. (literal)
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