1. Tuning of dielectric properties and magnetism of SrTiO3 by site-specific doping of Mn
- Author
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Choudhury, Debraj, Mukherjee, S, Mandal, P, Sundaresan, A, Waghamare, U V, Bhattacharjee, Satadeep, Mathieu, Roland, Lazor, Peter, Eriksson, Olle, Sanyal, Biplab, Nordblad, Per, Sharma, Ajay, Bhat, S V, Karis, Olof, Sarma, Dipankar Das, Choudhury, Debraj, Mukherjee, S, Mandal, P, Sundaresan, A, Waghamare, U V, Bhattacharjee, Satadeep, Mathieu, Roland, Lazor, Peter, Eriksson, Olle, Sanyal, Biplab, Nordblad, Per, Sharma, Ajay, Bhat, S V, Karis, Olof, and Sarma, Dipankar Das
- 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.
- Published
- 2011
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