Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/4641
Title: Absence of pseudogap in heavily overdoped Bi2Sr2CaCu2O8+? from tunneling spectroscopy of break junctions
Authors: Özyüzer, Lütfi
Zasadzinski, John F.
Gray, Kenneth E.
Kendziora, Christopher A.
Miyakawa, Nobuaki
Özyüzer, Lütfi
Izmir Institute of Technology. Physics
Keywords: Tunneling spectroscopy
Josephson current
Superconductors
Energy gap
Issue Date: May-2002
Publisher: Institute of Physics Publishing
Source: F., Özyüzer, L., Zasadzinski, J., Gray, K. E., Kendziora, C. A., Miyakawa, N. (2002). Absence of pseudogap in heavily overdoped Bi2Sr2CaCu2O8+δ from tunneling spectroscopy of break junctions. Europhysics Letters, 58(4), 589-595. doi:10.1209/epl/i2002-00436-6
Abstract: We report tunneling spectroscopy of superconductor-insulator-superconductor break junctions on heavily overdoped Bi2Sr2CaCu2O8+δ with Tc = 56 K. At T ≪ Tc, the junction conductances display well-defined quasiparticle peaks at ±2Δ and in some cases a Josephson current at zero bias. Gap values as small as Δ = 10.5 meV have been observed leading to 2Δ/kTc near the BCS limit for dx2-y2 pairing. Temperature dependence of the gap magnitude, Δ(T), follows the BCS relation and both the quasiparticle gap and Josephson current vanish for T > Tc. Above Tc, the tunneling conductance shows a flat background without any indication of a pseudogap near the Fermi level.
URI: http://doi.org/10.1209/epl/i2002-00436-6
http://hdl.handle.net/11147/4641
ISSN: 0295-5075
0295-5075
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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