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Oxidation state and site selection of gold in (YBa2Cu3O7 −δ)(1 − x)Au x

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Abstract

Recent experiments on the effect of Au substitution on the superconductivity of YBa2Cu3O7 −δ (YBCO) have revealed that Au, unlike most other dopants, enhances the superconducting transition temperature, T c, by ∼ 2 K at 10 mole % Au. In the present study. X-ray photoelectron spectra, nominally of 4, 6, 8 and 10 mole % Au-doped YBCO, have been obtained. The Au spectra display a relatively intense peak which is the oxidized component associated with the Au 4f7/2 core level, and an additional component that is most probably due to unreacted gold. The binding energy of the oxidized component is consistent with Au+. This observation, together with previous studies, leads us to postulate a structural model in which Au+ substitutes into a two-ligand c-axis co-ordinated Cu(1) site at a Ba-O (4) surface layer.

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Authors and Affiliations

  1. Department of Physics, Monash University, 3168, Clayton, Victoria, Australia

    G. Ganakas, M. J. Morgan & G. Jakovidis

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  1. G. Ganakas
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  2. M. J. Morgan
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  3. G. Jakovidis
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Ganakas, G., Morgan, M.J. & Jakovidis, G. Oxidation state and site selection of gold in (YBa2Cu3O7 −δ)(1 − x)Au x . J Mater Sci: Mater Electron 6, 244–247 (1995). https://doi.org/10.1007/BF00187205

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