Low energy electronic spectroscopy of an infinite-layer cuprate: A resonant inelastic X-ray scattering study of CaCuO2

✍ Scribed by B. Freelon; A. Augustsson; J.-H. Guo; P.G. Medaglia; A. Tebano; G. Balestrino; C.L. Dong; C.L. Chang; P.A. Glans; T. Learmonth; K.E. Smith; J. Nordgren; Z. Hussain

• Book ID: 104084407
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 500 KB
• Volume: 470
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2009.12.028

✦ Synopsis

We report the results of Oxygen K-edge soft X-ray absorption and emission spectroscopy that was performed on an infinite-layer insulating cuprate thin film CaCuO 2 . Experimentally obtained spectra are consistent with local density approximation calculations. X-ray absorption spectra show a close resemblance to spectra obtained from homologous single crystal cuprates. In addition to d-d excitations, X-ray emission spectra reveal the presence of Zhang-Rice singlet states in the infinite-layer CuO 2 planes. The question of whether the Zhang-Rice singlet features are masked by the O 2p main-band is addressed: it is possible to quantify the position of the Zhang-Rice singlet using emission intensity profiles. X-ray emission is demonstrated as a tool for understanding CuO 2 planar electronic correlation in the prototypical infinite-layer. The energy difference, 2.0 eV, between the oxygen main-band and the Zhang-Rice singlet band is found to match values obtained theoretically using established planar electronic correlation parameters.

Published by Elsevier B.V.