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05 December 2021
 
  » arxiv » 1504.7163

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Lattice dynamics in the paraelectric phase of PbHfO$_3$ studied by inelastic X-ray scattering
R. G. Burkovsky ; D. Andronikova ; Yu. Bronwald ; M. Krisch ; K. Roleder ; A. Majchrowski ; A. V. Filimonov ; A. I. Rudskoy ; S. B. Vakhrushev ;
Date 27 Apr 2015
AbstractWe report the results of an inelastic X-ray scattering study of the lattice dynamics in the paraelectric phase of the antiferroelectric lead hafnate PbHfO$_3$. The study reveals an avoided crossing between the transverse acoustic and transverse optic phonon modes propagating along the [1 1 0] direction with [1 -1 0] polarization. The static susceptibility with respect to the generally incommensurate modulations is shown to increase on cooling for the entire $Gamma$-M direction. We consider different approaches to the data analysis that correspond to different models for the temperature evolution of the dynamic susceptibility function. A number of similarities and differences between the lattice dynamics of PbHfO$_3$ and PbZrO$_3$ are described.
Source arXiv, 1504.7163
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