http://www.cnr.it/ontology/cnr/individuo/prodotto/ID207146
Enhancement of the finite-frequency superfluid response in the pseudogap regime of strongly disordered superconducting films (Articolo in rivista)
- Type
- Label
- 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
- 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
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- http://www.nature.com/srep/2013/130228/srep01357/full/srep01357.html (literal)
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- Rivista
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- Note
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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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