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

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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

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Keywords

  • Cu-O double chain
  • Photoemission spectroscopy
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Wakisaka, Y., Takubo, K., Sudayama, T., Son, J. Y., Mizokawa, T., Arita, M., Namatame, H., Taniguchi, M., Sekiya, S., Fukuda, K., Ishikawa, F., & Yamada, Y. (2008). Electronic structure of superconducting and non-superconducting Pr 2Ba4Cu7O15-δ revealed by photoemission spectroscopy. journal of the physical society of japan, 77(7), [074710]. https://doi.org/10.1143/JPSJ.77.074710