High-resolution photoemission study of FeSr2YCu2O7+δ

H. Matsui, T. Sato, S. Nishina, T. Takahashi, Y. Mihara, Y. Hata, K. Kadowaki, T. Mochiku

Research output: Contribution to journalConference articlepeer-review


We have performed high-resolution photoemission spectroscopy (PES) on FeSr2YCu2O7+δ, of which superconductivity of Tc=49K was recently reported. We clearly observed opening of a d-wave-like superconducting gap and estimated the maximum gap value (Δmax) to be 10 meV at 15 K. This gap value gives 2Δmax/kBTc ∼ 5, suggesting a strong-coupling nature of superconductivity in FeSr2YCu2O7+δ. Comparative PES study with superconducting and insulating samples shows that the valence band is rigidly shifted as a function of doping without evolution of additional states within the insulating gap.

Original languageEnglish
Pages (from-to)2329-2332
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Issue number12
Publication statusPublished - 2002 Dec
EventSNS 2001 - Chicago, IL, United States
Duration: 2001 May 132002 May 17


  • A. Superconductors
  • C. Photoelectron spectroscopy
  • D. Electronic structure


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