Hole-concentration dependence of band structure in (Bi,Pb) 2(Sr,La)2CuO6+δ determined by the angle-resolved photoemission spectroscopy

T. Kondo, T. Takeuchi, T. Yokoya, S. Tsuda, S. Shin, U. Mizutani

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Energy-momentum (E-k) dispersion and the shape of the Fermi surface (FS) in the (Bi,Pb)2(Sr,La)2CuO6+δ (Bi2201) superconductors of various hole-concentrations were investigated by the angle-resolved photoemission spectroscopy (ARPES) with high energy and momentum resolutions (ΔE = 10 meV and Δk = 0.005 Å-1). The E-k dispersion is kept rigid and the chemical potential moves towards lower or higher energies with increasing or decreasing hole-concentration, respectively, over a wide hole-concentration range from the nearly optimal-doped condition with a transition temperature of 32K to a heavily over-doped condition where the superconducting transition disappears. By comparing the shape of the FS determined for the present Bi2201 with that reported for the Bi 2Sr2CaCu2O8+δ (Bi2212), we found that the area surrounded by the FS in the Bi2201 is fairly larger than that in the Bi2212. Estimated hole-concentration in the Bi2201 was found to vary from 0.25 to 0.43 holes/Cu, that is more than twice as large as that in the optimally doped La2-xSrxCuO4 (LSCO) and Bi2212 superconductors of 0.17 holes/Cu.

Original languageEnglish
Pages (from-to)663-668
Number of pages6
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume137-140
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - Jul 1 2004
Externally publishedYes

Keywords

  • ARPES
  • Band structure
  • Bi2201
  • High-T
  • Hole-concentration

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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