2005/07/13 by R. Haumont, J. Kreisel, Pierre Bouvier +2 · 338 citations
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Artificial intelligence #Bismuth ferrite #Computer science #Condensed matter physics #Ferroelectric and Piezoelectric Materials #Ferroelectricity #Multiferroics #Multiferroics and related materials #Phase transition #Phonon #Physics #Quantum mechanics #Underwater Acoustics Research #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.73.132101
published in Physical Review B 73(13) (American Physical Society) · submitted to PRL (July 2005)
arxiv created 2005/07/13 · openalex publication_date 2006/04/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 Pm3m 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 N'eel temperature TN. We tentatively attribute these anomalies to the multiferroic character of BFO.