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Tuning of dielectric properties and magnetism of SrTiO3 by site-specific doping of Mn
Solid State and Structural Chemistry Unit, and Department of Physics, at Indian Institute of Science, Bangalore, Indien.
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, Indien.
Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, Indien.
Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, Indien.
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2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 84, no 12, 125124- p.Article in journal (Refereed) Published
Abstract [en]

Combining experiments with first-principles calculations, we show that site-specific doping of Mn into SrTiO(3) 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-d(0) 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 multiglass state in such systems.

Place, publisher, year, edition, pages
2011. Vol. 84, no 12, 125124- p.
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-139598DOI: 10.1103/PhysRevB.84.125124ISI: 000294923800001OAI: oai:DiVA.org:uu-139598DiVA: diva2:381735
Available from: 2010-12-28 Created: 2010-12-28 Last updated: 2017-12-11Bibliographically approved

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Publisher's full texthttp://link.aps.org/doi/10.1103/PhysRevB.84.125124

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Bhattacharjee, SatadeepMathieu, RolandLazor, PeterEriksson, OlleSanyal, BiplabNordblad, PerKaris, OlofSarma, Dipankar Das

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Physical Review B. Condensed Matter and Materials Physics
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