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Combining experiments with first principles calculations, we show thatsite-specific doping of Mn into SrTiO3 has a decisive influence on thedielectric properties of these doped systems. We find that phonon contributionsto the dielectric constant invariably decrease sharply on doping at any site.However, a sizable, random dipolar contribution only for Mn at the Sr sitearises from a strong off-centric displacement of Mn in spite of Mn being in anon-d0 state; this leads to a large dielectric constant at higher temperaturesand gives rise to a relaxor ferroelectric behavior at lower temperatures. Wealso investigate magnetic properties in detail and critically reevaluate thepossibility of a true multi-glass state in such systems.

Tuning of dielectric properties and magnetism of SrTiO3 by site-specific doping of Mn