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X-ray emission spectroscopy with EPMA applied to high Tc Superconductors using new spectrometer crystals

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Abstract

The High Temperature Superconductors are characterized by a very anisotropical structure and by typical arrangements of Cu- and O-atoms within CuO2-planes. In studying the electronic structure of these compounds there is a strong demand for high resolution valence band spectroscopy. Using an electron probe microanalyzer we study the X-ray emission of O-Kga and Cu-Lα emerging from polycrystalline YBa2Cu3O7 and Tl2Ba2Ca2Cu3O10. The O-Kα emission band is analyzed using a chlinochlore crystal in (001) orientation (2d = 28.4 Å). For the Cu-Lα emission band we use a beryl crystal in (10¯10) orientation (2d = 15.9 Å). Furthermore, orientation dependent X-ray emission spectroscopy of single-crystalline YBa2Cu3O7 and Tl2Ba2Ca1Cu2O8 specimens was performed. We present the partial O-Kα spectra which represent the O-2pη (η = x, y, z) electronic densities of states of the valence band and compare them with calculated data.

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Authors and Affiliations

  1. Max-Planck-Institute for Metal Research, Institute for Materials Science, D-70174, Stuttgart, Federal Republic of Germany

    A. Kottmann, P. Lamparter & S. Steeb

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  1. A. Kottmann
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  2. P. Lamparter
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  3. S. Steeb
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Kottmann, A., Lamparter, P. & Steeb, S. X-ray emission spectroscopy with EPMA applied to high Tc Superconductors using new spectrometer crystals. Mikrochim Acta 114, 343–351 (1994). https://doi.org/10.1007/BF01244561

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