Large magnetocapacitance in electronic ferroelectric manganite systems
- Nanostructured Materials Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032 (India)
- Experimental Condensed Matter Physics, Saha Institute of Nuclear Physics, Kolkata 700064 (India)
- Institute of Physics, J.W. Goethe University, D-60438 Frankfurt (Germany)
- National Research Technological University, “MISiS,” Moscow 119049 (Russian Federation)
We have observed a sizable positive magnetocapacitance (∼5%–90%) in perovskite Pr{sub 0.55}Ca{sub 0.45}MnO{sub 3} and bilayer Pr(Sr{sub 0.1}Ca{sub 0.9}){sub 2}Mn{sub 2}O{sub 7} system under 5 T magnetic field across 20–100 K below the magnetic transition point T{sub 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(Sr{sub 0.1}Ca{sub 0.9}){sub 2}Mn{sub 2}O{sub 7} 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{sub 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.
- OSTI ID:
- 22258746
- Journal Information:
- Journal of Applied Physics, Vol. 114, Issue 19; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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