Site-specific doping, tunable dielectric properties and intrinsic paramagnetism in Mn-doped SrTiO 3
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Mn doping in SrTiO3 leads to the emergence of qualitatively distinct and novel physical properties. We show that Mn ions can be controllably doped at either of the perovskite A (Sr) or B (Ti) site as well as at both sites simultaneously and the resultant physical properties depend intimately on the particular dopant site. We critically review the recent literature on various Mn-doped SrTiO3 systems, which includes reports of dielectric glass, spin-glass and ferromagnetism and by combining experiments with first-principles calculations, we demonstrate that depending on the particular dopant site for Mn ions, the dielectric properties can be widely tuned from a quantum paraelectric to a dielectric glass. However, the intrinsic magnetism in all these cases remains essentially paramagnetic for phase-pure systems.
KeywordsDoping relaxor paramagnet.
PACS Nos75.20.−g 77.80.Jk 71.30.+h
DC acknowledges exciting collaboration with S Mukherjee, P Mandal, A Sundaresan, U V Waghmare, S Bhattacharjee, R Mathieu, P Lazor, O Eriksson, B Sanyal, P Nordblad, A Sharma, S V Bhat, B Pal, O Karis, M Unnikrishnan and D D Sarma which contributed to most of the data and ideas presented in this review.
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- The aging and memory features associated with glassy magnetic behaviour of SrMnTiMn was further confirmed using DC magnetization memory experiments, as shown in ref. Google Scholar