Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB2 (Articolo in rivista)

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  • Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB2 (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
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  • 10.1103/PhysRevB.77.100507 (literal)
Alternative label
  • Ortolani, M; Dore, P; Di Castro, D; Perucchi, A; Lupi, S; Ferrando, V; Putti, M; Pallecchi, I; Ferdeghini, C; Xi, XX (2008)
    Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB2
    in Physical review. B, Condensed matter and materials physics (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ortolani, M; Dore, P; Di Castro, D; Perucchi, A; Lupi, S; Ferrando, V; Putti, M; Pallecchi, I; Ferdeghini, C; Xi, XX (literal)
Pagina inizio
  • 100507-1 (literal)
Pagina fine
  • 100507-4 (literal)
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  • 77 (literal)
Rivista
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  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • \"[Ortolani, M.] CNR, Ist Foton & Nanotecnol, I-00156 Rome, Italy; [Dore, P.; Di Castro, D.; Perucchi, A.; Lupi, S.] Univ Roma La Sapienza, CNR INFM Coherentia, I-00185 Rome, Italy; [Dore, P.; Di Castro, D.; Perucchi, A.; Lupi, S.] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; [Perucchi, A.; Lupi, S.] Sincrotrone Trieste, I-34012 Trieste, Italy; [Ferrando, V.; Putti, M.; Pallecchi, I.; Ferdeghini, C.] CNR, LAMIA, I-16146 Genoa, Italy; [Ferrando, V.; Putti, M.; Pallecchi, I.; Ferdeghini, C.] Univ Geneva, I-16146 Genoa, Italy; [Xi, X. X.] Penn State Univ, Dept Phys, University Pk, PA 16802 USA (literal)
Titolo
  • Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB2 (literal)
Abstract
  • The optical response of the two-band superconductor MgB2 has been studied in the 0.7-4 THz range on films with very low impurity level. The effect of the high-energy sigma gap is observed in the ratio R-S/R-N between the normal and superconducting state reflectance, while in a neutron irradiated film with a slightly higher impurity level, mainly the effect of the sigma gap is evident, as reported in previous experiments. At terahertz frequencies, the electrodynamics of MgB2 can be well described by the two-band parallel conductivity model and is dominated by the pi bands when the impurity level is only slightly higher than that of an ultraclean sample. (literal)
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