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Title: Modeling study of the dip-hump feature in Bi2 Sr2 CaCu2 O8+? tunneling spectroscopy
Authors: Romano, Pierom
Özyüzer, Lütfi
Yusof, Zikri
Kurter, Cihan
Zasadzinski, John F.
Özyüzer, Lütfi
Izmir Institute of Technology. Physics
Keywords: Tunneling phenomena
Josephson effects
Cuprate superconductors
Issue Date: 2006
Publisher: American Physical Society
Source: Romano, P., Özyüzer, L., Yusof, Z., Kurter, C., and Zasadzinski, J. F. (2006). Modeling study of the dip-hump feature in Bi2 Sr2 CaCu2 O8+δ tunneling spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 73(9). doi:10.1103/PhysRevB.73.092514
Abstract: The tunneling spectra of high-temperature superconductors on Bi2 Sr2 CaCu2 O8+δ (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.
ISSN: 1098-0121
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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