Diffuse phase transitions and random-field-induced domain states of the ‘‘relaxor’’ ferroelectric PbMg1/3Nb2/3O3

V. Westphal, W. Kleemann, and M. D. Glinchuk
Phys. Rev. Lett. 68, 847 – Published 10 February 1992
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Abstract

The diffuseness of the ferroelectric phase transition in PbMg1/3Nb2/3O3 is proposed to be due to quenched random electric fields originating from charged compositional fluctuations. They are responsible for the extreme critical slowing down, the freezing into nanometric ferroelectric domains, and the slow relaxation of the polarization below Tc∼212 K. Barkhausen jumps during poling exclude glassiness, which was conjectured previously. At Tc a ferroelectric anomaly of the dielectric permittivity appears, if the random fields are overcome by an external electric field.

  • Received 14 October 1991

DOI:https://doi.org/10.1103/PhysRevLett.68.847

©1992 American Physical Society

Authors & Affiliations

V. Westphal and W. Kleemann

  • Angewandte Physik, Universität Duisburg, W-4100 Duisburg 1, Germany

M. D. Glinchuk

  • Institute of Solid State Physics, Ukrainian Academy of Sciences, SU-252180 Kiev, Ukraine

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Vol. 68, Iss. 6 — 10 February 1992

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