Tunneling spectra of submicron Bi2Sr2CaCu2O8+ δ intrinsic Josephson junctions: evolution from superconducting gap to pseudogap

Solid State and Materials

Abstract

Tunneling spectra of near optimally doped, submicron Bi2Sr2CaCu2O8+ δ intrinsic Josephson junctions are presented, and examined in the region where the superconducting gap evolves into pseudogap. The spectra are analyzed using a self-energy model, proposed by Norman et al., in which both quasiparticle scattering rate Γ and pair decay rate ΓΔ are considered. The density of states derived from the model has the familiar Dynes’ form with a simple replacement of Γ by γ+ = (Γ+ΓΔ)/2. The γ+ parameter obtained from fitting the experimental spectra shows a roughly linear temperature dependence, which puts a strong constraint on the relation between Γ and ΓΔ. We discuss and compare the Fermi arc behavior in the pseudogap phase from the tunneling and angle-resolved photoemission spectroscopy experiments. Our results indicate an excellent agreement between the two experiments, which is in favor of the precursor pairing view of the pseudogap.

PACS

74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects 74.25.Jb Electronic structure 74.72.Hs Bi-based cuprates 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of SciencesBeijingP.R. China

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