High-frequency electron paramagnetic resonance investigation of Mn³⁺ centers in SrTiO₃

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• 作者：D.V. Azamat^a ; ^{azamat@fzu.cz} ; A.G. Badalyan^b ; A. Dejneka^a ; V.A. Trepakov^a ; ^b ; L. Jastrabik^a ; Z. Frait^a
• 关键词：A. Inorganic compounds ; D. Electron paramagnetic resonance (EPR) ; D. Magnetic properties
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2012
• 期刊代码：69_00223697
• 类别：ch
• 出版时间：July, 2012
• 卷：73
• 期：7
• 页码：822-826
• 文件大小：620 K

摘要

A high-frequency (49 and 70 GHz) electron paramagnetic resonance (EPR) study is reported on SrTiO₃ single crystals doped with 0.5-at%of manganese. EPR spectra originating from the S=2 ground state of Mn³⁺ ions are shown to belong to the different types of Jahn-Teller centers that arise as a result of varied ordering of the oxygen vacancies due to the reducing process. The present results indicate the strong covalent reduction of the density of unpaired spins (Fermi term) at the manganese nucleus for the various types of centers.