Local tunneling study of three-dimensional order parameter in the pi band of Al-doped MgB2 single crystals (Articolo in rivista)

Type
Label
  • Local tunneling study of three-dimensional order parameter in the pi band of Al-doped MgB2 single crystals (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.76.024507 (literal)
Alternative label
  • Giubileo, F; Bobba, F; Scarfato, A; Cucolo, AM; Kohen, A; Roditchev, D; Zhigadlo, ND; Karpinski, J (2007)
    Local tunneling study of three-dimensional order parameter in the pi band of Al-doped MgB2 single crystals
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Giubileo, F; Bobba, F; Scarfato, A; Cucolo, AM; Kohen, A; Roditchev, D; Zhigadlo, ND; Karpinski, J (literal)
Pagina inizio
  • 024507 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 76 (literal)
Rivista
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  • 6 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Salerno, CNR, INFM, Lab Reg SUPERMAT, I-84081 Baronissi, SA, Italy; Univ Salerno, Dipartimento Fis ER Caianiello, I-84081 Baronissi, SA, Italy; Univ Paris 06, INSP, Inst Nanosci Paris, CNRS,UMR 75 88, Paris, France; ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland (literal)
Titolo
  • Local tunneling study of three-dimensional order parameter in the pi band of Al-doped MgB2 single crystals (literal)
Abstract
  • We have performed an extensive study of the temperature and magnetic field dependencies of local tunneling spectra measured by means of variable temperature scanning tunneling spectroscopy on high quality Mg1-xAlxB2 single crystals. Single gap conductance spectra due to c-axis tunneling were measured, probing different amplitudes of the three-dimensional Delta(pi) as a function of Al content (i.e., as a function of the critical temperature T-C). We give clear evidence that the locally measured energy gap, as well as the upper critical field, reach maximum values Delta(pi)=2.4 meV and H-c2 >= 3 T around x similar or equal to 0.1 (T-C=33 K) regardless of the monotonous fall of T-C as a function of doping. Our results strongly suggest that different interband scattering occurs for different gap amplitudes. (literal)
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