Point-contact spectroscopy in neutron-irradiated Mg(11)B(2) (Articolo in rivista)

Type
Label
  • Point-contact spectroscopy in neutron-irradiated Mg(11)B(2) (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.74.174519 (literal)
Alternative label
  • D. Daghero; A. Calzolari; G. A. Ummarino; M. Tortello; R. S. Gonnelli; V. A. Stepanov; C. Tarantini; P. Manfrinetti; E. Lehmann (2006)
    Point-contact spectroscopy in neutron-irradiated Mg(11)B(2)
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • D. Daghero; A. Calzolari; G. A. Ummarino; M. Tortello; R. S. Gonnelli; V. A. Stepanov; C. Tarantini; P. Manfrinetti; E. Lehmann (literal)
Pagina inizio
  • 174519 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 74 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 11 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Fisica and CNISM, Politecnico di Torino, 10129 Torino, Italy P.N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia CNR-INFM-LAMIA and Dipartimento di Fisica, Universit√† di Genova, 16146 Genova, Italy CNR-INFM-LAMIA and Dipartimento di Chimica e Chimica Industriale, Universit√† di Genova, 16146 Genova, Italy Department of Spallation Neutron Source SINQ, Paul Scherrer Institut, CH-5232 Villigen, Switzerland (literal)
Titolo
  • Point-contact spectroscopy in neutron-irradiated Mg(11)B(2) (literal)
Abstract
  • We report on recent results of point-contact spectroscopy measurements in Mg11B2 polycrystals irradiated at different neutron fluences up to ?=1.4?1020 cm-2. The point contacts were made by putting a small drop of Ag paint--acting as the counterelectrode--on the cleaved surface of the samples. The gap amplitudes were extracted from the experimental conductance curves, showing Andreev-reflection features, through a two-band Blonder-Tinkham-Klapwijk fit and reported as a function of the Andreev critical temperature of the junctions, Tc A. The resulting ???Tc A? and ???Tc A? curves show a clear merging of the gaps when Tc A?9 K that perfectly confirms the findings of specific-heat measurements in the same samples. Anomalous contacts with Tc A?Tc ?being Tc the bulk critical temperature? were often obtained, particularly in samples irradiated at very high fluences. Their fit gave a different dependence of ?? on Tc A. The possible origin of these contacts is discussed in terms of local current-induced annealing and/or nanoscale inhomogeneities observed by STM in the most irradiated samples. (literal)
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