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Journal of Physics: Condensed Matter Volume 21 Number 45 Create an alert RSS this journal

N Mufti et al 2009 J. Phys.: Condens. Matter 21 452203 doi:10.1088/0953-8984/21/45/452203

Magnetic field induced ferroelectric to relaxor crossover in Tb1−xCaxMnO3

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N Mufti1,3, G R Blake1, A A Nugroho1,2 and T T M Palstra1

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Abstract References

FAST TRACK COMMUNICATION

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.


PACS

77.22.Ej Polarization and depolarization

75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction

77.80.Bh Phase transitions and Curie point

72.80.Sk Insulators

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 45 (11 November 2009)

Received 23 September 2009

Published 21 October 2009



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