X-ray absorption and resonant photoemission studies of Mn doped SrTiO₃ epitaxial films

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• 作者：Jerzy Kubacki ; Dariusz Kajewski ; Annemarie Koehl ; Marcin Wojtyniak ; Regina Dittmann ; Jacek Szade
• 关键词：X-ray absorption spectroscopy ; Photoemission ; Synchrotron radiation ; Strontium titaniate ; Thin film ; Manganese doping
• 刊名：Radiation Physics and Chemistry
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：93
• 期：Complete
• 页码：123-128
• 全文大小：1014 K

文摘

Synchrotron radiation was used to measure X-ray absorption and resonant photoemission of epitaxial Mn doped SrTiO₃ film. The spectra together with the modeling revealed that Mn valence state depends on the ions localization in the film and on the annealing temperature. The XAS spectra can be fitted by the composition of Mn³⁺ and Mn²⁺. Surface region was richer in trivalent Mn, while deeper layers and the film annealed in UHV at 630 ¡ãC exhibited mostly divalent Mn ions. Partial density of Mn 3d electronic states derived from the resonant photoemission showed a significant contribution to the in-gap states.