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