RF-sputtered MoS2 films revealing the characteristics of bulk type II orientation on GaAs are reported for the first time. It is found that RF power and temperature have a pronounced effect on film morphology. Type II bulk-oriented films are obtained with a combination of low RF power and high substrate temperature. The results on GaAs are successfully interpreted within the context of an extension to the imperfection nucleation model of film formation. Films deposited on glass display an unusual morphology consisting of two distinct phases. Such phases may be related to the presence of sodium in the glass that leads to chemical texturing via a sodium thio-molybdate phase.
Recent experiments on the effect of Au substitution on the superconductivity of YBa2Cu307_~ (YBCO) have revealed that Au, unlike most other dopants, enhances the superconducting transition temperature, Tc, 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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