Choudhury, D. ; Mukherjee, S. ; Mandal, P. ; Sundaresan, A. ; Waghmare, U. V. ; Bhattacharjee, S. ; Mathieu, R. ; Lazor, P. ; Eriksson, O. ; Sanyal, B. ; Nordblad, P. ; Sharma, A. ; Bhat, S. V. ; Karis, O. ; Sarma, D. D. (2011) Tuning of dielectric properties and magnetism of SrTiO3 by site-specific doping of Mn Physical Review B: Condensed Matter and Materials Physics, 84 (12). 125124_1-125124_7. ISSN 1098-0121
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Official URL: http://prb.aps.org/abstract/PRB/v84/i12/e125124
Related URL: http://dx.doi.org/10.1103/PhysRevB.84.125124
Abstract
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 multiglass state in such systems.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 89897 |
| Deposited On: | 02 May 2012 13:23 |
| Last Modified: | 16 Jul 2012 07:07 |
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