Modeling study of the dip-hump feature in Bi2Sr2CaCu2O8+delta tunneling spectroscopy (Articolo in rivista)

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  • Modeling study of the dip-hump feature in Bi2Sr2CaCu2O8+delta tunneling spectroscopy (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.73.092514 (literal)
Alternative label
  • Romano, P; Ozyuzer, L; Yusof, Z; Kurter, C; Zasadzinski, JF (2006)
    Modeling study of the dip-hump feature in Bi2Sr2CaCu2O8+delta tunneling spectroscopy
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Romano, P; Ozyuzer, L; Yusof, Z; Kurter, C; Zasadzinski, JF (literal)
Pagina inizio
  • 092514-1 (literal)
Pagina fine
  • 092514-4 (literal)
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  • also selected for the April 1, 2006 issue of Virtual Journal of Applications of Superconductivity (literal)
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  • 73 (literal)
Rivista
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  • 4 (literal)
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  • 9 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Sannio, CNR, INFM, SUPERMAT Salerno, I-82100 Benevento, Italy; Univ Sannio, DSBA, I-82100 Benevento, Italy; Izmir Inst Technol, Dept Phys, TR-35430 Izmir, Turkey; Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA; IIT, Div Phys, Chicago, IL 60616 USA (literal)
Titolo
  • Modeling study of the dip-hump feature in Bi2Sr2CaCu2O8+delta tunneling spectroscopy (literal)
Abstract
  • The tunneling spectra of high-temperature superconductors on Bi2Sr2CaCu2O8+delta (Bi-2212) reproducibly show a high-bias structure in the form of a dip-hump at voltages higher than the gap voltage. Of central concern is whether this feature originates from the normal state background or is intrinsic to the superconducting mechanism. We address this issue by generating a set of model conductance curves-a 'normal state' conductance that takes into account effects such as the band structure and a possible pseudogap, and a pure superconducting state conductance. When combined, the result shows that the dip-hump feature present in the experimental conductance curves cannot be naively attributed to a normal state effect. In particular, strong dip features found in superconductor-insulator-superconductor data on optimally doped Bi-2212, including negative dI/dV, cannot be a consequence of an extrinsic pseudogap. However, such features can easily arise from state-conserving deviations in the superconducting density of states, e.g., from strong-coupling effects. (literal)
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