Ultrafast quasiparticle relaxation dynamics in high quality epitaxial FeSe0.5Te0.5 thin films (Articolo in rivista)

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Label
  • Ultrafast quasiparticle relaxation dynamics in high quality epitaxial FeSe0.5Te0.5 thin films (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0953-2048/26/7/075018 (literal)
Alternative label
  • C Bonavolontà1,2, L Parlato1,2, G P Pepe1,2, C de Lisio1,2, M Valentino1,2, E Bellingeri3, I Pallecchi3, M Putti3 and C Ferdeghini3 (2013)
    Ultrafast quasiparticle relaxation dynamics in high quality epitaxial FeSe0.5Te0.5 thin films
    in Superconductor science and technology (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • C Bonavolontà1,2, L Parlato1,2, G P Pepe1,2, C de Lisio1,2, M Valentino1,2, E Bellingeri3, I Pallecchi3, M Putti3 and C Ferdeghini3 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84878807799&partnerID=q2rCbXpz (literal)
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  • 26 (literal)
Rivista
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  • 7 (literal)
Note
  • Scopu (literal)
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  • 1 Department of Physics, University of Naples 'Federico II', Italy 2 CNR-SPIN, Piazzale Tecchio 80, I-80125 Naples, Italy 3 CNR-SPIN, Corso Perrone 24, I-16152 Genova, Italy (literal)
Titolo
  • Ultrafast quasiparticle relaxation dynamics in high quality epitaxial FeSe0.5Te0.5 thin films (literal)
Abstract
  • Femtosecond spectroscopy has been used to investigate the quasiparticle relaxation times in a nearly optimally doped chalcogenide superconducting FeSe0.5Te0.5 thin film. It is characterized by an enhancement of the critical temperature Tc = 19.1 K by strain. Experimental results indicate the existence of a temperature dependence of the quasiparticle recombination time ?R in the superconducting state where an energy gap ?(T) is present. A fitting procedure based on a BCS-like assumption for ?R gives ?0 = 4.1 ± 0.4 meV for the superconducting energy gap extrapolated at T = 0, which corresponds to 2?0/kBTc = 4.9 ± 0.5. Accordingly, an estimation of the characteristic phonon energy and the electron-phonon coupling constant ? is reported and discussed. The obtained value ? ? 0.6 is in good agreement with other similar determinations obtained by different techniques and numerical approaches. The small value of ? confirms that a phonon-mediated coupling cannot be the only mechanism leading to the formation of the superconducting state in FeSeTe films. © 2013 IOP Publishing Ltd. (literal)
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