Brillouin spectroscopic evidence for a relaxation mode in ferroelectric PbHPO4 and PbDPO4

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.51.8005
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TypeArticle
Journal titlePhysical Review B : Condensed Matter and Materials Physics
Volume51
Issue13
Pages80058011; # of pages: 7
AbstractBrillouin spectra of ferroelectric PbHPO4 (Tc=310 K) and its deuterated isomorph PbDPO4 (Tc=462 K) have been measured as a function of temperature across their transition temperatures. Certain longitudinal acoustic waves are found to exhibit anomalous propagation in the vicinity of Tc. The relaxation times, τ0, for a noninteracting dipole are evaluated from the Brillouin shifts, based on a phenomenological approach. The τ0 values are the same in both PbHPO4 and PbDPO4, indicating that the ferroelectric transition is driven by an order-disorder relaxation mode. This study also reveals that the paraelectric phase symmetry is, on a macroscopic scale, centrosymmetric.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Microstructural Sciences
Peer reviewedNo
NPARC number12327557
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Record identifier8793be9b-68e3-4ab1-adb6-b6fe26872e18
Record created2009-09-10
Record modified2016-05-09
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