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Paper detail

Infrared phonon dynamics of multiferroic BiFeO3 single crystal

We discuss the first infrared reflectivity measurement on a BiFeO3 single crystal between 5 K and room temperature. The 9 predicted ab-plane E phonon modes are fully and unambiguously determined. The frequencies of the 4 A1 c-axis phonons are found. These results settle issues between theory and data on ceramics. Our findings show that the softening of the lowest frequency E mode is responsible for the temperature dependence of the dielectric constant, indicating that the ferroelectric transition in BiFeO3 is soft-mode driven.

preprint2007arXivOpen access
R. P. S. M. LoboR. L. MoreiraD. LebeugleD. Colson
cond-mat.mtrl-sci
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R. P. S. M. LoboR. L. MoreiraD. LebeugleD. Colson

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