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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 |
Keywords: | Tunneling spectroscopy Josephson current Superconductors Energy gap |
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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