ISSN:
1573-482X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
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Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00187205
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