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

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

2010-09-24

arxiv.org/abs/1009.4792v2

Phys. Rev. B 84,125124 (2011)

Physics

Condensed Matter

Materials Science

24 Pages, 2 Tables, 9 Figures

Scientific paper

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

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