Magnetic field induced ferroelectric to relaxor crossover in Tb(1-x)Ca(x)MnO(3).
J Phys Condens Matter
; 21(45): 452203, 2009 Nov 11.
Article
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| MEDLINE
| ID: mdl-21694003
ABSTRACT
The influence of magnetic field on the electrical properties of Tb(1-x)Ca(x)MnO(3) has been investigated by means of dielectric, polarization and neutron diffraction measurements. A field of 6 T applied along the b-axis induces a crossover from ferroelectric to relaxor behavior for the x = 0.02 compound at temperatures close to the ferroelectric transition. The mechanism of this field induced crossover involves a decrease in the coherence length of the Mn-spin-spiral structure due to increasing electron hopping rates associated with double exchange. Moreover, a large negative magnetocapacitance is observed at the freezing temperature for x = 0.05, which originates from suppression of the relaxor state and thus represents a new mechanism of magnetocapacitance.
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2009
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Article