期刊
PHYSICAL REVIEW B
卷 84, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.125124
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资金
- Department of Science and Technology, Government of India
- Board of Research in Nuclear Sciences, Government of India
- Swedish Foundation for International Cooperation in Research and Higher Education (STINT)
- Swedish Research Council (VR)
- SIDA
- European Research Council (ERC) [247062]
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-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.
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