Abstract
Electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR) studies were performed on heavily manganese doped SrTiO3 crystals. At low temperatures (T≈6K), the ENDOR measurements on MnTi4+ show the presence of electric field gradient associated with the electrical polarization. The observation of EPR signals of rhombic Mn2+ complexes remotely compensated in the SrTiO3 lattice is discussed in connection with local disorder in which Mn2+ appears due to the reduction process.
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