Tuning of dielectric properties and magnetism of SrTiO3 by site-specific doping of Mn

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 multi-glass state in such systems.

arXiv comment24 Pages, 2 Tables, 9 Figures

References in corpus (7)

• Phonons and related properties of extended systems from density-functional perturbation theory
• First-principles study of ferroelectric and antiferrodistortive instabilities in tetragonal SrTiO3
• Electronic and Magnetic Structures of Sr2FeMoO6
• Disorder effects in electronic structure of substituted transition metal compounds
• Electron spin resonance investigation of Mn^{2+} ions and their dynamics in manganese doped SrTiO_3
• Spectral functions in doped transition metal oxides
• Superparamagnetism and Spin Glass Dynamics of Interacting Magnetic Nanoparticle Systems

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• Multiglass properties and magnetoelectric coupling in uniaxial anisotropic spin-cluster-glass Fe2TiO5
• Magnetization in electron- and Mn- doped SrTiO3
• Intrinsic paramagnetism and aggregation of manganese dopants in SrTiO${}_3$
• Novel dielectric anomalies due to spin-chains above and below Neel temperature in Ca3Co2O6