Electronic structure of superconducting and non-superconducting Pr 2Ba4Cu7O15-δ revealed by photoemission spectroscopy

Yuki Wakisaka*, Kou Takubo, Takaaki Sudayama, Jin Young Son, Takashi Mizokawa, Masashi Arita, Hirofumi Namatame, Masaki Taniguchi, Syun Sekiya, Kazunori Fukuda, Fumihiro Ishikawa, Yuh Yamada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In order to understand the nature of chain-driven superconductivity in Pr2Ba4Cu7O15-δ (Pr247), we have studied the electronic structure of as-sintered non-superconducting Pr247 and annealed superconducting Pr247 samples using photoemission spectroscopy. The O 1s, Ba 3d, Pr 4d, and Cu 2p core-level energy shifts by annealing indicate that electrons doped by the annealing mainly fill the localized Fehrenbacher-Rice (FR) state. The photoemission spectra ρ(ω) near the Fermi level (EF) are derived from the metallic Cu-O double chain and can be fitted to the power-law function plus step function Aω α + Bθ(ω). ρ(ω) near EF is indistinguishable between the as-sintered and annealed Pr247 and the exponent α is ∼1.5. These results indicate that the Cu-O double chain provides the spectral weight near EF and that the annealing affects the localized FR state instead of the near-EF state.

Original languageEnglish
Article number074710
Journaljournal of the physical society of japan
Volume77
Issue number7
DOIs
Publication statusPublished - 2008 Jul 1
Externally publishedYes

Keywords

  • Cu-O double chain
  • Photoemission spectroscopy
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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