Investigation of Li-doped MgB2 (Articolo in rivista)

Type
Label
  • Investigation of Li-doped MgB2 (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0953-2048/22/9/095014 (literal)
Alternative label
  • I Pallecchi; P Brotto; C Ferdeghini; M Putti; A Palenzona; ;P Manfrinetti; A Geddo Lehmann; A Orecchini; C Petrillo; F Sacchetti; M Affronte; G Allodi; R De Renzi; S Serventi; A Andreone; G Lamura; D Daghero; R S Gonnelli; M Tortello (2009)
    Investigation of Li-doped MgB2
    in Superconductor science & technology (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • I Pallecchi; P Brotto; C Ferdeghini; M Putti; A Palenzona; ;P Manfrinetti; A Geddo Lehmann; A Orecchini; C Petrillo; F Sacchetti; M Affronte; G Allodi; R De Renzi; S Serventi; A Andreone; G Lamura; D Daghero; R S Gonnelli; M Tortello (literal)
Pagina inizio
  • 095014 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 22 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 12 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR/INFM-LAMIA and Dipartimento di Fisica, Via Dodecaneso 33, I-16146 Genova, Italy CNR/INFM-LAMIA and Dipartimento di Chimica e Chimica Industriale, Via Dodecaneso 31, I-16146 Genova, Italy Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria, Strada Provinciale Monserrato-Sestu km. 0.700, I-09042 Monserrato (Ca), Italy CNR-INFM CRS-SOFT and Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy Institut Laue-Langevin, F-38042 Grenoble, France CNR-INFM-S3 and Dipartimento di Fisica, Universit`a di Modena e Reggio Emilia, Via G.Campi 213/A, I-41100 Modena, Italy Unità CNISM di Parma e Dipartimento di Fisica, I-43100 Parma, Italy 8 CNR/INFM Coherentia and Dipartimento di Scienze Fisiche, Università Federico II, I-80125 Napoli, Italy Dipartimento di Fisica and CNISM, Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy (literal)
Titolo
  • Investigation of Li-doped MgB2 (literal)
Abstract
  • We present a systematic characterization of Mg 1 - x Li x B 2 polycrystalline samples with nominal Li content x up to 0.30. We explore the effectiveness of the substitution and investigate its influence on superconducting and normal state properties. The structural analyses by neutron and x-ray diffraction indicate that, despite the lattice parameters remaining unchanged within the experimental accuracy, around 30% of the nominal Li content actually enters the structure. Also the transition temperature is only weakly affected by Li substitution, but its relationship with the residual resistivity and magnetoresistivity data is compatible with a picture where ? bands are filled with holes and/or affected by disorder, as predicted by theory. We also measured the magnetic penetration depth ? by an inductance technique. Data fits based on the standard Bardeen-Cooper-Schrieffer two-band model yield the zero-temperature limit of both ? and superconducting gaps: we find that ?(0) increases weakly and quickly saturates with increasing x, whereas ? ? (0) and ? ? (0) decrease with x. This analysis suggests that lithium substitution induces disorder mainly in the ? band. Point contact spectroscopy results on samples obtained from the same batch are in full agreement with magnetic penetration depth data on the undoped sample, but give superconducting gaps almost insensitive to Li substitution, showing at most a small increase in ? ? (0) that may be related to an inhomogeneous distribution of Li content. (literal)
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