Thermal conductivity of MgB2 in the superconducting state (Articolo in rivista)

Type
Label
  • Thermal conductivity of MgB2 in the superconducting state (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.67.064505 (literal)
Alternative label
  • Putti M., Braccini V., Galleani d'Agliano E., Napoli F., Pallecchi I., Siri A.S., Manfrinetti P., Palenzona A. (2003)
    Thermal conductivity of MgB2 in the superconducting state
    in Physical review. B, Condensed matter and materials physics (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Putti M., Braccini V., Galleani d'Agliano E., Napoli F., Pallecchi I., Siri A.S., Manfrinetti P., Palenzona A. (literal)
Pagina inizio
  • 064505 (literal)
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  • 67 (literal)
Rivista
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  • 6 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
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  • INFM-LAMIA/CNR, Dipartimento di Fisica, Via Dodecaneso 33, 16146 Genova, Italy INFM, Dipartimento di Chimica e Chimica Industriale, Via Dodecaneso 31, 16146 Genova, Italy (literal)
Titolo
  • Thermal conductivity of MgB2 in the superconducting state (literal)
Abstract
  • We present thermal conductivity measurements on very pure and dense bulk samples, as indicated by residual resistivity values as low as 0.5 ?? cm and thermal conductivity values higher than 200 W/mK. In the normal state we found that the Wiedemann-Franz law, in its generalized form, works well suggesting that phonons do not contribute to the heat transport. The thermal conductivity in the superconducting state has been analyzed by using a two-gap model. Thanks to the large gap anisotropy we were able to evaluate quantitatively intraband scattering relaxation times of ? and ? bands, which depend on the disorder in different way; namely, as the disorder increases, it reduces more effectively the relaxation times of ? than that of ? bands, as suggested by a recent calculation [Mazin et al., Phys. Rev. Lett. 89, 107002 (2002)]. (literal)
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