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Tuning of dielectric properties and magnetism of SrTiO(3) by site-specific doping of Mn

Choudhury, D and Mukherjee, S and Mandal, P and Sundaresan, A and Waghmare, UV and Bhattacharjee, S and Mathieu, R and Lazor, P and Eriksson, O and Sanyal, B and Nordblad, P and Sharma, A and Bhat, SV and Karis, O and Sarma, DD (2011) Tuning of dielectric properties and magnetism of SrTiO(3) by site-specific doping of Mn. In: Physical Review B: Condensed Matter and Materials Physics, 84 (12).

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Official URL: http://prb.aps.org/abstract/PRB/v84/i12/e125124

Abstract

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.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to The American Physical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 29 Sep 2011 11:31
Last Modified: 29 Sep 2011 11:31
URI: http://eprints.iisc.ernet.in/id/eprint/41006

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