Low energy electronic spectroscopy of an infinite-layer cuprate: A resonant inelastic X-ray scattering study of CaCuO2
2010 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 470, no 3, 187-192 p.Article in journal (Refereed) Published
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 CaCuO2 Experimentally obtained spectra arc 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 CuO2 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 CuO2 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.
Place, publisher, year, edition, pages
2010. Vol. 470, no 3, 187-192 p.
Electronic structure, X-ray absorption spectra, X-ray emission spectra, Electronic density of states, High-temperature superconductors, Calcium compounds, Infinite-layer cuprates
IdentifiersURN: urn:nbn:se:uu:diva-136789DOI: 10.1016/j.physc.2009.12.028ISI: 000275613600001OAI: oai:DiVA.org:uu-136789DiVA: diva2:377486