Magnetic field induced ferroelectric to relaxor crossover in Tb1-xCaxMnO3

N. Mufti*, G. R. Blake, A. A. Nugroho, T. T. M. Palstra

*Corresponding author for this work

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Abstract

The influence of magnetic field on the electrical properties of Tb1-xCaxMnO3 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.

Original languageEnglish
Article number452203
Pages (from-to)452203-1-452203-6
Number of pages6
JournalJournal of Physics-Condensed Matter
Volume21
Issue number45
DOIs
Publication statusPublished - 11-Nov-2009

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