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Phys. Rev. B 73, 132101 (2006) - Phonon anomalies and the ferroelectric phase transition in multiferroic ${\mathrm{BiFeO}}_{3}$

Phonon anomalies and the ferroelectric phase transition in multiferroic BiFeO3

R. Haumont, J. Kreisel, P. Bouvier, and F. Hippert
Phys. Rev. B 73, 132101 – Published 4 April 2006

Abstract

We report a temperature-dependent Raman scattering investigation of the multiferroic material bismuth ferrite BiFeO3 (BFO). The observed loss of the Raman spectrum at the ferroelectric Curie temperature TC should be in agreement with a cubic Pm3¯m structure of the high-temperature paraelectric phase. Surprisingly, the ferroelectric-to-paraelectric phase transition is not soft-mode driven, indicating a nonconventional ferroelectric. Furthermore, our results reveal pronounced phonon anomalies around the magnetic Néel temperature TN. We tentatively attribute these anomalies to the multiferroic character of BFO.

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  • Received 24 October 2005

DOI:https://doi.org/10.1103/PhysRevB.73.132101

©2006 American Physical Society

Authors & Affiliations

R. Haumont1, J. Kreisel1,*, P. Bouvier2, and F. Hippert1

  • 1Laboratoire des Matériaux et du Génie Physique (CNRS), ENS de Physique de Grenoble, B.P. 46, 38402 St. Martin d’Hères, France
  • 2Laboratoire d’Electrochimie et de Physicochimie des Matériaux et des Interfaces (CNRS), ENSEEG, BP 75, 38402 St. Martin d’Hères Cedex, France

  • *Author to whom correspondence should be addressed. Electronic address: jens.kreisel@inpg.fr

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Issue

Vol. 73, Iss. 13 — 1 April 2006

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