Angle-resolved photoemission study of superconducting ladder compound Sr14-xCaxCu24O41

T. Sato, T. Yokoya, T. Takahashi, M. Uehara, T. Nagata, J. Goto, J. Akimitsu

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Angle-resolved photoemission spectroscopy has been performed on Sr14-xCaxCu24O41 (x = 0-11.5) which consists of two-leg Cu2O3 ladders and edge-sharing CuO2 chains. A dispersive band with the periodicity of ladder sublattice is observed near the Fermi level (EF) for x=0. The band shows a minimum binding energy at ka= (2n + 1)π/2, suggesting that a Mott-Hubbard gap opens on the ladder. This indicates that copper atoms on the ladder take essentially the divalent state (Cu2+) and a majority of self-doped holes reside on the chain. We found that the Ca substitution causes a transfer of holes from the chain to the ladder.

Original languageEnglish
Pages (from-to)1912-1916
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume59
Issue number10-12
DOIs
Publication statusPublished - Jan 1 1998
Externally publishedYes

Keywords

  • Angle-resolved photoemission
  • Band structure
  • Ladder compound
  • Mott-Hubbard gap
  • SrCaCuO

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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