Synchrotron-radiation photoemission study of the high-Tc superconductor YBa2Cu3O7

T. Takahashi, F. Maeda, H. Arai, H. Katayama-Yoshida, Y. Okabe, T. Suzuki, S. Hosoya, A. Fujimori, T. Shidara, T. Koide, T. Miyahara, M. Onoda, S. Shamoto, M. Sato

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94 Citations (Scopus)


Photoemission measurements have been performed on the high-Tc superconductor YBa2Cu3O6.85 using synchrotron radiation of 20- 110 eV. It is found that the valence band is shifted by 1.1 to 1.6 eV towards higher binding energy relative to band calculations. The effective intraatomic Coulomb energy between d electrons (Udd) was evaluated from the energy position of the valence-band satellite due to the two-hole bound state: Udd=5-6 eV, which is comparable to the valence-band width (W=6-7 eV). This strongly suggests that electron correlation plays a key role in characterizing the electronic properties of this oxide superconductor.

Original languageEnglish
Pages (from-to)5686-5689
Number of pages4
JournalPhysical Review B
Issue number10
Publication statusPublished - 1987


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