https://doi.org/10.1140/epjb/e2009-00299-7
Tunneling spectra of submicron Bi2Sr2CaCu2O8+δ intrinsic Josephson junctions: evolution from superconducting gap to pseudogap
Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China
Corresponding author: a spzhao@aphy.iphy.ac.cn
Received:
12
January
2009
Revised:
22
June
2009
Published online:
11
September
2009
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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009
