Synchrotron-radiation photoemission study of the high-Tc superconductor YBa2Cu3O7−δ
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
DOI 10.1103/PhysRevB.36.5686 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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