Magnetic field induced ferroelectric to relaxor crossover in Tb1-xCaxMnO3

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

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

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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.

Originele taal-2English
Artikelnummer452203
Pagina's (van-tot)452203-1-452203-6
Aantal pagina's6
TijdschriftJournal of Physics-Condensed Matter
Volume21
Nummer van het tijdschrift45
DOI's
StatusPublished - 11-nov-2009

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