Electronic structure of Sr{sub 2}RuO{sub 4}: X-ray fluorescence emission study
- Institute of Metal Physics, Russian Academy of Sciences, Ural Division, 620219 Yekaterinburg GSP-170 (Russia)
- Department of Physics, Tulane University, New Orleans, Louisiana 70118 (United States)
- Synchrotron Radiation Laboratory, Institute of Solid State Physics, University of Tokyo, 3-2-1 Midori-cho, Tanashi-shi, Tokyo 188 (Japan)
- Department of Physics, University of Tennessee, Knoxville, Tennessee 37996 (United States)
- Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
- JRCAT, Tsukuba 305 (Japan)
- Department of Physics, Tohoku University, Sendai 980-77 (Japan)
- MSRC, Indian Institute of Technology, Madras 600036 (India)
The results of measurements of O 1s total x-ray-fluorescence yield and Ru N{sub 2,3} and O K{sub {alpha}} x-ray fluorescence emission spectra of Sr{sub 2}RuO{sub 4} and Sr{sub 2}RuO{sub 4.25} are presented. An excitation energy dependence of the O K{sub {alpha}} x-ray emission spectra (XES) was observed in both compounds. The energy dependence of the spectra is attributed to the excitation of inequivalent O (1) in-plane and O(2) apical oxygens. The O(1) 2p and O(2) 2p density of states distribution in the valence band of Sr{sub 2}RuO{sub 4} was found to be different in accordance with the results of band-structure calculations. O(1) 2p states are found to be mixed with Ru 4d(t{sub 2g}) states providing the formation of {pi} bonds. While the O K{sub a} XES spectra are in fair agreement with band structure calculations, the theoretical two-peak distribution of Ru N{sub 2,3} XES is found to be different with respect to the intensity ratios and widths of the peaks of Ru N{sub 2,3} XES. These differences are attributed to a decrease of intensity of radiative 4d{r_arrow}4p transitions in the vicinity of the Fermi level (where the localization of Ru 4d states is higher than at the bottom of the valence band) due to a strong Koster-Kronig transition. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 567062
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 57, Issue 3; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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