Large magnetocapacitance in electronic ferroelectric manganite systems

We have observed a sizable positive magnetocapacitance (∼5%–90%) in perovskite Pr0.55Ca0.45MnO3 and bilayer Pr(Sr0.1Ca0.9)2Mn2O7 system under 5 T magnetic field across 20–100 K below the magnetic transition point TN. The magnetodielectric effect, on the other hand, exhibits a crossover: (a) from pos...

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Veröffentlicht in:Journal of applied physics 2013-11, Vol.114 (19)
Hauptverfasser: Chowdhury, Ujjal, Goswami, Sudipta, Bhattacharya, Dipten, Midya, Arindam, Mandal, P., Das, Pintu, Mukovskii, Ya. M.
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Sprache:eng
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Zusammenfassung:We have observed a sizable positive magnetocapacitance (∼5%–90%) in perovskite Pr0.55Ca0.45MnO3 and bilayer Pr(Sr0.1Ca0.9)2Mn2O7 system under 5 T magnetic field across 20–100 K below the magnetic transition point TN. 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 TCO. Large magnetocapacitance in these systems shows a typical multiferroic behavior even though the ferroelectric polarization is small in comparison to that of other ferroelectrics.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4831944