Probing the valence band structure of Cu2 O using high-energy angle-resolved photoelectron spectroscopy

Anneli Önsten, Martin Månsson, Thomas Claesson, Takayuki Muro, Tomohiro Matsushita, Tetsuya Nakamura, Toyohiko Kinoshita, Ulf O. Karlsson, Oscar Tjernberg

研究成果: Article査読

59 被引用数 (Scopus)

抄録

We present angle-resolved photoemission data along the M-Γ-M direction from a Cu2 O (111) single crystal, collected at high photon energies (hν=619 and 891 eV) and T=100 K. Because of the high photon energies and effective background subtraction, our data give a clear picture of the bulk band structure. The results confirm the existence of a hybridized Cu 3d-Cu 4s state located between the two main Cu 3d and O 2p band regions. Several theoretical studies have predicted the existence of this band, but until now it has not been detected in any photoemission measurements. The experimentally derived band structure is compared to local density approximation calculations with and without the Hubbard potential U. The clear band dispersion in our experimental data has enabled us to extract a refined Hubbard U value, which makes it possible to achieve a better agreement between theoretically calculated bands and experimental data.

本文言語English
論文番号115127
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
76
11
DOI
出版ステータスPublished - 2007 9 26
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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