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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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
Publication:	Physical Review B: Condensed Matter and Materials Physics
Publisher:	The American Physical Society
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.ac.in/id/eprint/41006

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