Photoemission spectroscopy of composition and doping of high-temperature superconductors

Philippe Almeras; Helmuth Berger; Giorgio Margaritondo; Jian Ma; Marshall Onellion

doi:10.1117/12.182695

10 August 1994 Photoemission spectroscopy of composition and doping of high-temperature superconductors

Philippe Almeras, Helmuth Berger, Giorgio Margaritondo, Jian Ma, Marshall Onellion

Proceedings Volume 2158, Oxide Superconductor Physics and Nano-Engineering; (1994) https://doi.org/10.1117/12.182695
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We present a systematic study of compositional and doping effects in Bi₂Sr₂CaCu₂O_y high-T_c 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.

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Philippe Almeras, Helmuth Berger, Giorgio Margaritondo, Jian Ma, and Marshall Onellion "Photoemission spectroscopy of composition and doping of high-temperature superconductors", Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); https://doi.org/10.1117/12.182695

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