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Proceedings Paper

Photoemission spectroscopy of composition and doping of high-temperature superconductors
Author(s): Philippe Almeras; Helmuth Berger; Giorgio Margaritondo; Jian Ma; Marshall Onellion
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Paper Abstract

We present a systematic study of compositional and doping effects in Bi2Sr2CaCu2Oy high-Tc superconductors performed with photoemission spectroscopy. The study has been extended to Y-doping and I-intercalation of Bi-2212 high quality single crystals. The main results is that each type of dopant affects the crystal composition in its own way. Yttrium affects the Ca and Sr planes, producing a charge transfer into the CuO planes. For I-doping, we find that the main effect is a change in the interplanar distance, but X-ray Photoemission Spectroscopy (XPS) allows to see that the decrease of the over-doping of copper planes (hole doping). We performed also a comparative study by Angle Resolved Ultraviolet Photoemission Spectroscopy (ARUPS) between this sample and an oxygen annealed specimen. XPS Cu2p core level data establish that the hole concentration in the CuO2 planes is essentially the same for these two kinds of samples. ARUPS measurements show that electronic structure of the normal states near the Fermi level has been strongly affected by iodine intercalation.

Paper Details

Date Published: 10 August 1994
PDF: 12 pages
Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); doi: 10.1117/12.182695
Show Author Affiliations
Philippe Almeras, Swiss Federal Institute of Technology/Lausanne (Switzerland)
Helmuth Berger, Swiss Federal Institute of Technology/Lausanne (Switzerland)
Giorgio Margaritondo, Swiss Federal Institute of Technology/Lausanne (Switzerland)
Jian Ma, Univ. of Wisconsin (United States)
Marshall Onellion, Univ. of Wisconsin (United States)

Published in SPIE Proceedings Vol. 2158:
Oxide Superconductor Physics and Nano-Engineering
Davor Pavuna; Ivan Bozovic, Editor(s)

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