Granularity-induced gapless superconductivity in nbn films: Evidence of thermal phase fluctuations (Articolo in rivista)

Type
Label
  • Granularity-induced gapless superconductivity in nbn films: Evidence of thermal phase fluctuations (Articolo in rivista) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.65.104507 (literal)
Alternative label
  • Lamura G., Villigier J.-C., Gauzzi A., Le Cochec J., Laval J.Y., Placais B., Hadacek N., Bok J. (2002)
    Granularity-induced gapless superconductivity in nbn films: Evidence of thermal phase fluctuations
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Lamura G., Villigier J.-C., Gauzzi A., Le Cochec J., Laval J.Y., Placais B., Hadacek N., Bok J. (literal)
Pagina inizio
  • 104507 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 65 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Using a single-coil mutual inductance technique, we measure the low-temperature dependence of the magnetic penetration depth in superconducting NbN films prepared with similar critical temperatures approximate to16 K but with different microstructures. Only (100) epitaxial and weakly granular (100) textured films display the characteristic exponential dependence of conventional BCS s-wave superconductors. More granular (111)-textured films exhibit a linear dependence, indicating a gapless state in spite of the s-wave gap. This result is quantitatively explained by a model of thermal phase fluctuations favored by the granular structure. (literal)
Titolo
  • Granularity-induced gapless superconductivity in nbn films: Evidence of thermal phase fluctuations (literal)
Abstract
  • Using a single-coil mutual inductance technique, we measure the low-temperature dependence of the magnetic penetration depth in superconducting NbN films prepared with similar critical temperatures approximate to16 K but with different microstructures. Only (100) epitaxial and weakly granular (100) textured films display the characteristic exponential dependence of conventional BCS s-wave superconductors. More granular (111)-textured films exhibit a linear dependence, indicating a gapless state in spite of the s-wave gap. This result is quantitatively explained by a model of thermal phase fluctuations favored by the granular structure. (literal)
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