2007/02/28 by V. V. Laguta, I. V. Kondakova, И. В. Кондакова +8
Materials Science · Physics and Astronomy · #Ferroelectric and Piezoelectric Materials #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #cond-mat.soft
paper · pdf · doi:10.1103/physrevb.76.054104
16 pages, 6 figures
arxiv created 2007/02/28 · openalex publication_date 2007/08/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Using electron spin resonance (ESR), the lattice position and dynamic properties of Mn2+ ions were studied in 0.5 and 2\phantom\rule0.3em0exat.\phantom\rule0.2em0ex% manganese-doped SrTiO3 ceramics prepared by the conventional mixed oxide method. The measurements show that Mn2+ ions preferably (up to 97%) substitute for the Sr if the ceramics are prepared with a deficit of Sr ions. Motional narrowing of the Mn2+ ESR spectrum was observed when the temperature increased from 120\phantom\rule0.3em0ex\phantom\rule0.3em0exto\phantom\rule0.3em0ex240--250\phantom\rule0.3em0exK, which was explained as a manifestation of the off-center position of this ion at the Sr site. From the analysis of the ESR spectra, the activation energy Ea=86\phantom\rule0.3em0exmV and frequency factor 1∕\ensuremathτ0\ensuremath≈(1--5)1013\phantom\rule0.3em0exs^\ensuremath-1 for the jumping of the impurity between symmetrical off-center positions were determined. Both are in agreement with those previously derived from the dielectric relaxation. This proves that the origin of the dielectric anomaly in SrTiO3:Mn is produced by the reorientation dynamics of Mn2+ dipoles.