Effects of isoelectronic Ru substitution at the Fe site on the energy gaps of optimally F-doped SmFeAsO (Articolo in rivista)

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  • Effects of isoelectronic Ru substitution at the Fe site on the energy gaps of optimally F-doped SmFeAsO (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0953-2048/25/8/084012 (literal)
Alternative label
  • D. Daghero,1 M. Tortello,1 G.A. Ummarino,1 V.A. Stepanov,2 F. Bernardini,3 M. Tropeano,4 M. Putti,5, 4 and R.S. Gonnelli1 (2012)
    Effects of isoelectronic Ru substitution at the Fe site on the energy gaps of optimally F-doped SmFeAsO
    in Superconductor science and technology (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • D. Daghero,1 M. Tortello,1 G.A. Ummarino,1 V.A. Stepanov,2 F. Bernardini,3 M. Tropeano,4 M. Putti,5, 4 and R.S. Gonnelli1 (literal)
Pagina inizio
  • 84012 (literal)
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  • 25 (literal)
Rivista
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  • 11 (literal)
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  • 1 Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, 10129 Torino, Italy 2 P.N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia 3 Dipartimento di Fisica, Università di Cagliari, 09042 Monserrato (CA), Italy 4 Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, 16146 Genova, Italy 5 CNR-SPIN, Corso Perrone 24, 16152 Genova, Italy (literal)
Titolo
  • Effects of isoelectronic Ru substitution at the Fe site on the energy gaps of optimally F-doped SmFeAsO (literal)
Abstract
  • We studied the effects of isoelectronic Ru substitution at the Fe site on the energy gaps of optimally F-doped SmFeAsO by means of point-contact Andreev reflection spectroscopy. The results show that the SmFe_{1-x}Ru_{x}AsO_{0.85}F_{0.15} system keeps a multigap character at least up to x=0.50, and that the gap amplitudes Delta_1 and Delta_2 scale almost linearly with the local critical temperature TcA. The gap ratios 2Delta_i/(kB Tc) remain approximately constant only as long as Tc > 30 K, but increase dramatically when Tc decreases further. This trend seems to be common to many Fe-based superconductors, irrespective of their family. Based on first-principle calculations of the bandstructure and of the density of states projected on the different bands, we show that this trend, as well as the Tc dependence of the gaps and the reduction of Tc upon Ru doping, can be explained within an effective three-band Eliashberg model as being due to a suppression of the superfluid density at finite temperature that, in turns, modifies the temperature dependence of the characteristic spin-fluctuation energy. (literal)
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