Synchrotron-radiation photoemission study of the high-TcsuperconductorYBa2Cu3O7−δ

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Abstract

Photoemission measurements have been performed on the high-${T}_{c}$ superconductor Y${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6.85}$ 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 (${U}_{\mathrm{dd}}$) was evaluated from the energy position of the valence-band satellite due to the two-hole bound state: ${U}_{\mathrm{dd}}=5\ensuremath{-}6$ eV, which is comparable to the valence-band width ($W=6\ensuremath{-}7$ eV). This strongly suggests that electron correlation plays a key role in characterizing the electronic properties of this oxide superconductor.

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