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Title: Large magnetocapacitance in electronic ferroelectric manganite systems

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.
Authors:
; ;  [1] ; ;  [2] ;  [3] ;  [4]
  1. Nanostructured Materials Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032 (India)
  2. Experimental Condensed Matter Physics, Saha Institute of Nuclear Physics, Kolkata 700064 (India)
  3. Institute of Physics, J.W. Goethe University, D-60438 Frankfurt (Germany)
  4. National Research Technological University, “MISiS,” Moscow 119049 (Russian Federation)
Publication Date:
OSTI Identifier:
22258746
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 19; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; COMPARATIVE EVALUATIONS; FERROELECTRIC MATERIALS; LAYERS; MAGNETIC FIELDS; PEROVSKITE; POLARIZATION; TEMPERATURE RANGE