Chowdhury, Ujjal and Goswami, Sudipta and Bhattacharya, Dipten and Midya, Arindam and Mandal, P and Das, Pintu and Mukovskii, Ya M (2013) Large magnetocapacitance in electronic ferroelectric manganite systems. Journal of Applied Physics, 114 (19). Article No-194104. ISSN 0021-8979

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We have observed a sizable positive magnetocapacitance (similar to 5%-90%) in perovskite Pr0.55Ca0.45MnO3 and bilayer Pr(Sr0.1Ca0.9)(2)Mn2O7 system under 5 T magnetic field across 20-100 K below the magnetic transition point T-N. The magnetodielectric effect, on the other hand, exhibits a crossover: (a) from positive to negative for the perovskite system and (b) from negative to positive for the bilayer system over the same temperature range. The bilayer Pr(Sr0.1Ca0.9) 2Mn2O7 system exhibits a sizable anisotropy as well. We have also noticed the influence of magnetic field on the dielectric relaxation characteristics of these systems. These systems belong to a class of improper ferroelectrics and are expected to exhibit charge/orbital order driven ferroelectric polarization below the transition point T-CO. Large magnetocapacitance in these systems shows a typical multiferroic behavior even though the ferroelectric polarization is small in comparison to that of other ferroelectrics. (C) 2013 AIP Publishing LLC.

Item Type: Article
Subjects: Electronics
Divisions: Nano-Structured Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 05 Feb 2014 09:19
Last Modified: 05 Feb 2014 09:19

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