Study of the electrodynamic response of mgb2 sintered pellets and thin films (Articolo in rivista)

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  • Study of the electrodynamic response of mgb2 sintered pellets and thin films (Articolo in rivista) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1142/S0217979202011408 (literal)
Alternative label
  • Andreone A., Di Gennaro E., Lamura G., Salluzzo M., Le Cochec J., Gauzzi A., Cantoni C., Paranthaman M., Ceresara S., Giunchi G. (2002)
    Study of the electrodynamic response of mgb2 sintered pellets and thin films
    in International journal of modern physics b
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Andreone A., Di Gennaro E., Lamura G., Salluzzo M., Le Cochec J., Gauzzi A., Cantoni C., Paranthaman M., Ceresara S., Giunchi G. (literal)
Pagina inizio
  • 1599 (literal)
Pagina fine
  • 1603 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.worldscientific.com/doi/abs/10.1142/S0217979202011408 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 16 (literal)
Rivista
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  • 5 (literal)
Note
  • Google Scholar (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • A. ANDREONE, E. DI GENNARO, G. LAMURA and M. SALLUZZO I.N.F.M. and Dipartimento Scienze Fisiche, Universita' Federico II, Napoli, Italy J. LE COCHEC Laboratoire Pierre S¨ue, DRECAM, CEA-Saclay, 91191 Gif sur Yvette, France A. GAUZZI MASPEC-CNR Institute, Area delle Scienze, 43010 Parma-Fontanini, Italy C. CANTONI and M. PARANTHAMAN Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA S. CERESARA and G. GIUNCHI Edison S.p.A., Milano, Italy (literal)
Titolo
  • Study of the electrodynamic response of mgb2 sintered pellets and thin films (literal)
Abstract
  • We present a number of experimental results on the temperature dependence of the magnetic penetration depth lambda and on the temperature and field dependence of the microwave surface impedance Z(s) = R-s + iX(s) in both pellets and thin films of MgB2, exhibiting critical temperatures ranging between 26 and 38 K. Accurate measurements of Z(s)(H, T) were performed by means of a sapphire dielectrically loaded cavity operating in the microwave region (20 GHz). The study of lambda(T) was carried out employing a single coil mutual inductance technique in the MHz region. An anisotropic s-wave BCS model can account for the temperature dependence experimentally observed in the penetration depth data of the best films, confirming previous reports on the conventional nature of superconductivity in diborides. On the contrary, films having a reduced value of the critical temperature and pellets show no evidence of saturation, and the experimental results strictly follow a quadratic dependence down to the lowest temperatures. We explain this behavior with the presence of metallic Mg inclusions that may locally depress the gap. The study of the surface impedance versus temperature and field shows also that the source of microwave loss can be markedly different, depending on the structural and transport properties of the samples (literal)
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