High-resolution photoemission study of low-Tc superconductors: Phonon-induced electronic structures in low-Tc superconductors and comparison with the results of high-Tc cuprates

T. Yokoya, A. Chainani, T. Kiss, S. Shin, K. Hirata, N. Kameda, T. Tamegai, T. Nishio, H. Uwe

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Recent advances in the energy resolution and cryogenic techniques used in photoemission spectroscopy have enabled us to directly observe the superconducting electronic structure of superconductors with a relatively lower transition temperature (low-Tc). In this paper, we report photoemission results on low-Tc superconductors measured with an ultrahigh-resolution low-temperature photoemission spectrometer. The result of Nb3Al exhibits a superconducting gap and a phonon-induced peak-dip-hump structure characteristic of the strong-coupling superconducting spectral function. From measurements of Ba0.67K0.33BiO3, we observe isotropic s-wave superconducting gap opening below Tc as well as depletion of intensity near the Fermi level above Tc, which can be attributed to a phonon-induced pseudogap. We will compare these photoemission results with those of high-Tc superconductors.

Original languageEnglish
Pages (from-to)97-101
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - Oct 1 2002
Externally publishedYes

Keywords

  • Photoemission spectroscopy
  • Pseudogap
  • Superconducting gap

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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