Influences of energy dependent quasiparticle lifetime effect on tunneling spectra of high-TC superconductors

Satoshi Kashiwaya, Akira Sugimoto, Hiromi Kashiwaya, Tetsuro Matsumoto, Hiroshi Eisaki, Masao Koyanagi, Hiroki Tsuchiura, Yukio Tanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The local electronic states of optimally doped Bi2Sr 2CaCu2O8+δ (Bi2212) and Ln-doped Bi 2Sr1.6Ln0.4CuO6+δ (Ln-Bi2201, Ln=La, Gd) were measured by low-temperature scanning tunneling spectroscopy. Spatially inhomogeneous electronic states were detected for all samples, and the gap amplitudes were distributed in the range between 40-140meV in the case of Bi2212 and 30-200meV in the case of Ln-Bi2201.The spectra showed enhanced coherence peaks with large residual conductance when the gap amplitude was relatively small, while the peaks in the spectra were gradually broadened as the gap amplitude became larger. We demonstrate that a series of spectra with various gap amplitudes obtained on a single sample is systematically reproduced by the conductance spectra for d-wave BCS density of states which take account of the energy dependent quasiparticle lifetime broadening factor. This fact indicates the presence of serious influences of an intrinsic broadening effect due to the strong electron correlation in tunneling spectroscopy of high-T c superconductors.

Original languageEnglish
Title of host publicationLOW TEMPERATURE PHYSICS
Subtitle of host publication24th International Conference on Low Temperature Physics - LT24
Pages523-524
Number of pages2
DOIs
Publication statusPublished - 2006 Dec 1
EventLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
Duration: 2006 Aug 102006 Oct 17

Publication series

NameAIP Conference Proceedings
Volume850
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
CountryUnited States
CityOrlando, FL
Period06/8/1006/10/17

Keywords

  • Pseudogap
  • Superconductivity
  • Tunneling spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kashiwaya, S., Sugimoto, A., Kashiwaya, H., Matsumoto, T., Eisaki, H., Koyanagi, M., Tsuchiura, H., & Tanaka, Y. (2006). Influences of energy dependent quasiparticle lifetime effect on tunneling spectra of high-TC superconductors. In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 (pp. 523-524). (AIP Conference Proceedings; Vol. 850). https://doi.org/10.1063/1.2354815