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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2011

Geometric resonances in far-infrared reflectance spectra of PbTiO(3) ceramics

Résumé

The complex dielectric permittivity of PbTiO(3) ceramics in the THz frequency range has been investigated theoretically and by a far-infrared reflectance technique. Besides the well-known polar modes of bulk PbTiO(3), the experiment reveals several additional modes identified as geometrical resonances (i.e., extraneous hybrid excitations created by inhomogeneous depolarization fields). A comparison of the experiment and model calculations suggests that the strong geometrical modes located near 300 and 500 cm(-1) are associated with the presence of 90 degrees ferroelectric walls.
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hal-00632951 , version 1 (17-10-2011)

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J. Hlinka, E. Simon, Christine Bogicevic, Fabienne Karolak, P.E. Janolin. Geometric resonances in far-infrared reflectance spectra of PbTiO(3) ceramics. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 84 (9), pp.092104. ⟨10.1103/physRevB.84.092104⟩. ⟨hal-00632951⟩
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