Dependence of the electronic structure ofSrRuO3and its degree of correlation on cation off-stoichiometry
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Abstract
We have grown and studied high quality $\mathrm{Sr}\mathrm{Ru}{\mathrm{O}}_{3}$ films grown by molecular beam epitaxy as well as pulsed laser deposition. By changing the oxygen activity during deposition, we were able to make $\mathrm{Sr}\mathrm{Ru}{\mathrm{O}}_{3}$ samples that were stoichiometric (low oxygen activity) or with ruthenium vacancies (high oxygen activity). This ability to control the ruthenium stoichiometry has permitted us to make a systematic study of the dependence of the degree of electron correlation in $\mathrm{Sr}\mathrm{Ru}{\mathrm{O}}_{3}$ on stoichiometry using transport and photoemission experiments. We have compared the measured ultraviolet photoemission spectroscopy spectra with calculated density of states spectra and offer explanations for the large observed differences between the two.
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